One Direction fans were 'crushed' during the band's gig in Peru, leaving 47 young people needing medical attention.
The boyband - made up of Harry Styles, Zayn Malik, Louis Tomlinson and Liam Payne - stopped performing during the concert and warned the audience they would walk off stage if they didn't stop pushing each other.
Mario Cassareto from the Estadio Nacional stadium told a Peruvian radio station: "We treated 47 children with the first stages of asphyxia. Everything is under control. We have nothing to be ashamed of, we've handled the situation well.
"We put in place a second evacuation plan so that the younger fans were not affected."
He insists venue bosses are working with the police and security companies who were contracted for the show."
Mario added: "It's under control. We are still treating those with symptoms of asphyxia that we pulled from the back. The ministry of health has set up tents."
A video taken from inside the venue shows singer Niall Horan warning the crowd: "If you don't want anyone to take us off the stage, make sure you stay back."
Bandmate Liam Payne added: "Or we'll have to go - and we don't want to go."
It was only the group's second of 69 shows as part of their 'Where We Are' world tour.
The 'Little Things' hitmakers kicked off their tour at the El Campin Stadium in Bogota, Colombia, where 44,000 fans filled the stadium.

Jared Leto is exploring movie roles following the success of 'Dallas Buyers Club'.
The 42-year-old actor - who won an Oscar for Best Supporting Actor for his portrayal of transsexual AIDS victim Rayon - took a six-year break from Hollywood to work on his music career with band 30 Seconds To Mars and is planning to make a comeback following the success of the biographical drama.
Talking to the Associated Press, he explained: "I'm looking at scripts and reading scripts. Which is interesting because I didn't read scripts for years before 'Dallas Buyers Club'.
"But now you have opportunities to work with people that you really respect or admire, people whose work has been inspiring and influential."
Leto is also contemplating helming a film when he has the "right" story to tell.
He enthused: "I think that would be really great. And when I have the right story to tell I'll certainly do that."

James Franco is set to appear in 'Dawn of the Planet of the Apes'.
The 36-year-old actor starred as Will Rodman in 'Rise of the Planet of the Apes' and although his character was not set to return for the sequel, director Matt Reeves has now revealed he could make a cameo.
Asked whether unused scenes from the last film were to appear in 'Dawn of the Planet of the Apes', he told Collider.com: "There is an appearance that he makes which is not about some ending that they ... there's no reprise of the footage that they shot of his death or anything like that."
Freida Pinto, who starred alongside Franco as Caroline Aranha in the 2011 film will not reprise her role, while Andy Serkis - who stars as Gollum in 'Lord of the Rings' and 'The Hobbit' - will return as the ape Caesar.
Explaining the relevance of Franco's appearance, Reeves said: "Essentially the idea is that Caesar has ties to both communities, to the humans because he has a human father in Will, who died in the viral apocalypse, and then he has the apes who are his family now...
"We felt this movie is so much about his emotional perspective that in order to set that into a framework you needed to refer to essentially his father.
"So, in a way that I won't totally give away, we essentially have a moment where you have Caesar sort of reminiscing or connecting to who Will was and what he meant to him."
Gary Oldman, 'The Americans' actress Keri Russell and Judy Greer will star alongside Andy Serkis in 'Dawn of the Planet of the Apes', which is set to be released in July.

Jared Harris wants to take on roles which "scare" himself.
The 'Quiet Ones' actor - who stars opposite Sam Claflin and Olivia Cooke in the horror film - believes it's important to take on a variety of parts because it will help him develop professionally if he steps outside of his comfort zone.
He told collider.com: "I like auditioning, it's important to keep auditioning. Generally speaking if you're auditioning for something, you're auditioning for a role that people can't see you in and you need to convince them that you're the right person. If you only take parts that are offered to you, you end up playing the same roles over and over again. I think it's important to keep auditioning. I think it's important to scare yourself, to take parts that are outside of your comfort zone. That's sort of been my MO for my whole career. I keep trying to change it up."
Harris insists the ratio of auditions and success when auditioning doesn't change.
He added: "The last time I auditioned, I auditioned with Spielberg for the 'Lincoln' movie. I audition for stuff all the time, and what's weird about it is that one's success rate at auditioning doesn't really change. It's sort of at the same ratio of stuff you audition for to things you land."

Tom Hardy wears Sir Elton John's old clothes.
The 36-year-old actor portrays the 'Candle in the Wind' singer in forthcoming biopic 'Rocketman' and has borrowed a number of "bits" from the star in order to better get into character.
He said: "When I play a real person, I like to have bits of them. Since I can't take physical body parts and sever those, I try and grab as much 'kit' off them as possible."
And he joked he will then make a profit from the garments.
He added: "Then you can sell it on eBay."
Meanwhile, the British star - who has six-year-old son Louis with ex-girlfriend Rachael Speed - also admitted he didn't learn to drive until he was 30 and that was out of necessity.
Speaking at a cinema society screening of his new movie 'Locke', he explained: "I had to take my ex to the hospital to have our son Louis."
Tom finds it easy to make choices on what roles to accept.
He said: "It comes back to a very basic principle of story. Is it interesting? Do I want to be a part of it? Yes. How does it work? That's when you get back to a pragmatic sense of 'What's the practical next step?' I don't get up in the morning and go, 'I have to find a piece where I can look into someone's eyes.' "

Kim Kardashian's Vogue cover is set to be the highest-selling issue of the magazine.
It has been reported the 'Keeping Up with the Kardashians' star is on track to sell a record number of copies justifying Anna Wintour's decision to feature the reality star and her fiancé Kanye West in the April issue of the fashion bible.
A source told RadarOnline.com: "The projections are that Kim and Kanye will likely sell almost 500,000 copies."
The figures are yet to be confirmed, but it's thought Kim's cover could outsell previous issues featuring Beyoncé and America's First Lady Michelle Obama which sold 355,39 and 293,798 copies respectively.
Kim's highly coveted cover didn't come without controversy with many people boycotting the issue, including actress Sarah Michelle Gellar who took to Twitter to say she would be cancelling her subscription following the decision to put Kim - who shot to fame following the leak of her sex tape in 2007 - on the front of the publication.
Wintour was ultimately forced to defend her decision to feature the couple, following rumours Kanye had begged her for months to feature his fiancée on the cover.
The editor said: "As for the cover, my opinion is that it is both charming and touching, and it was, I should add, entirely our idea to do it; you may have read that Kanye begged me to put his fiancée on Vogue's cover. He did nothing of the sort. The gossip might make better reading, but the simple fact of the matter is that it isn't true."

Tila Tequila has split from the father of her baby.
The reality TV star made the "surprise" announcement just last week that she was expecting her first child, and it has now emerged she has already gone her separate ways from her Georgia-based partner Thomas Paxton Whitaker.
He told RadarOnline.com: "Even though I had nothing negative to say about Tila in my comment to you, and the two of us are soon to share a child with one another, Tila and I are not together as a couple and we are no longer pursuing a relationship with each other."
Tila's bitter ex regrets singing the bisexual star's praises in a recent interview and is frustrated with her reaction to discovering his bankruptcy, accusing her of "deception and manipulation" of the media.
Thomas, 42 said: "She definitely isn't living with me. I was trying to remain cordial without adding to her already notorious past, and now I am now experiencing the fallout from my generosity.
"Somehow because I went through hard times like a lot of other people when the economy took a decline, and had to file for bankruptcy, I'm somehow unsuitable to be connected to in a relationship.
"If the media could only hear the kinds of comments Miss Nguyen makes about them as individuals behind closed doors. I doubt she would ever get a drop of news coverage again for the rest of her days, but then Hollywood is a lot about deception and manipulation ... isn't it?"
Playboy model Tila, 32, rose to greater fame on MTV show 'A Shot at Love With Tila Tequila' in 2007, which saw a group of men and women vying for her attention.
She initially wrote on Facebook: "Surprise!! I'm 10 weeks pregnant! I just couldn't hold it in any longer as this brings me so much joy and happiness to know that there is a baby Tila on the way!"

Mariah Carey celebrates life anniversaries not birthdays.
The 44-year-old star - who was catapulted to the spotlight after her 1990 single 'Vision of Love' reached the top spot in charts across the world - has revealed she celebrates important moments in her life and not ageing.
Quizzed on whether she worries about the challenge of pop culture's fixation of youth since she's been a star for the past 25 years, she told the Observer Magazine: "First of all don't round up. If you're going to round, round down. I don't count years but I definitely rebuke them - I have anniversaries, not birthdays because I celebrate life, darling."
Before she added: "Please put a LOL next to this, because people are going to be like WTF?"
Mariah - who has two-year-old twins, Moroccan and Monroe, with her husband Nick Cannon who she wed in 2008 - insists she's "eternally 12 years old" and never wants to grow up.
She said: "Darling, I'm eternally 12 years old. I'm going to give her to you."

Chris Jericho has described the late Ultimate Warrior as a "legendary guy" who gave him a confidence boost when he was starting his career.
The Fozzy singer - who still competes on a part-time basis for WWE - was as shocked as anyone when the wrestler tragically passed away on April 8, just days after he was inducted into the WWE Hall of Fame.
Jericho met Warrior at the start of his grappling career when he was competing for now-defunct company WCW (World Championship Wrestling) and he never forgot the words of encouragement he gave him backstage at a TV taping and he says he totally deserved to be honoured for his impact of the wrestling business.
Speaking to BANG Showbiz, Jericho said: "I only treat people the way that they treat me and I only met Warrior once and he was really gracious and really cool to me back in 1998 in WCW. He was there to do something with Hulk Hogan and I remember I went up to say hi to him and he went, 'Hey, Chris Jericho, I know you, you're doing a great job you're doing some good work.' I was a nobody at the time and I remember thinking, 'Wow, the Warrior likes me that totally smokes.' It made me feel that I must be doing something right and it gave me a little bit of a boost and I always remembered that ... He's definitely a legendary guy that deserves to be in the Hall of Fame, I'm glad he got to go in when he was still alive."
As a youngster Jericho, 43, was a huge fan of the Warrior - who died from a heart attack - and he never will forget the intensity he had in WWE (World Wrestling Entertainment).
He added: "As a fan in the late 80s when Warrior came out, he had this energy, this intensity and his look; he was like a heavy metal guy - or he came across that way - and so was I, so I liked that.
"I always respected him as a performer, some of his matches were pretty quick I remember he came in the Winnipeg arena once and beat Andre the Giant in 30 seconds, at the time I was like, 'What a rip off! That sucks.' But I remember WrestleMania VI where he had a classic with Hulk Hogan, much like a lot of guys from that time period he had good matches when he had the right opponent."
Jericho is coming to the UK for two Q&A shows at the Leicester Square Theatre in London on June 12 and June 15 (Psievents.eventbrite.co.uk) and will also be playing at Download Festival with his heavy metal band Fozzy and he can't wait to see his British fans again.
He said: "I'm so excited about coming to the UK on a lot of different levels; I've got a couple of spoken word shows and then right in the middle I'm playing the main stage at Download with Fozzy, it's going to be a good week for Chris Jericho for sure."

One Direction, Katy Perry and Kings of Leon will perform at Radio 1's Big Weekend.
The free music event, which takes place this year in Glasgow, Scotland, from May 23 to May 25, have managed to secure the boy band - made up of Harry Styles, Louis Tomlinson, Liam Payne and Zayn Malik - for the festival, despite them having another show on the same day in Dublin, Ireland.
The 'Little Things' hitmakers will also join Ed Sheeran, Kings of Leon, Coldplay, Tinie Tempah, John Newman, The Vamps and The 1975, who are all on the bill.
One Direction, who kicked off their 'Where We Are Tour' this month, which will see them play more than 60 dates across the world, will headline on the Friday night, with Coldplay topping the bill on Saturday and Kings Of Leon on Sunday.
In a statement, One Direction said: "We're so excited to perform at Radio 1's Big Weekend in Glasgow. Glasgow we are coming to get you. We're going to put on a great show and we can't wait to see you all there."
Kings of Leon drummer Nathan Followill also said: "We're so excited to play Radio 1's Big Weekend. We've heard great things, and we can't wait to experience them first-hand."
The 50,000 free tickets available for this year's event were snapped up in less than one hour and Ben Cooper, controller at Radio 1, described the line-up as "phenomenal", adding: "It's probably the best in the world this year, in one of the world's great music cities."

Eva Longoria was all smiles as she arrived at LAX airport in Los Angeles. The 'Desperate Housewives' star teamed her all black ensemble with an electric blue jacket and sunglasses.

Taylor Swift enjoyed a can of diet coke as she left her apartment in Tribeca, New York City. The 'Red' singer teamed her navy shirt dress with black shades and heeled brogues as she strolled around the Big Apple.