JLS have made it through to the X-Factor final
Five teenage girls have been injured at a free concert performed by X Factor finalists JLS.
About 2,000 people had gathered for the concert at the 1,500-capacity Fairfield Halls in Croydon, south London.
Fans were reportedly pushed forward when the crowd swelled as children gathered for tickets to see the boy band on Monday.
London Ambulance Service said four of the girls were taken to hospital, having suffered minor injuries.
Four ambulances had been called to the scene, said a spokesman.
"We treated five patients. They were all teenage girls. Four of them were taken to Mayday Hospital in south London," he said.
"There was one with a hand injury, one with difficulty in breathing and two who were also just taken unwell.
"The fifth was treated at the scene."
One concert-goer told the Croydon Guardian she was helped from the crowd after suffering an asthma and panic attack.
"I'd been queuing since 1pm but when the school kids turned up it became so busy with them all pushing us towards the front," she said.
"There was a pregnant woman in the crowd. It was horrible. I couldn't move. I couldn't get out."
The Metropolitan Police said officers were called to Fairfield Halls at 1600 GMT after "reports of crushing at a free music event".
The hall management did not comment on the incident but confirmed the band were playing at the venue.
The four-piece group JLS, whose name stands for Jack the Lad Swing, are through to the X Factor final this weekend along with Eoghan Quigg and Alexandra Burke.