Three women have died in a stampede at a Halloween party in Madrid, Spanish officials say.
They say that two more people were seriously injured at the gathering at the Madrid Arena.
It was not immediately known what caused the crush, but reports suggest the panic began after a flare was thrown in the crowd.
The indoor arena, which can house up to 10,000 people, was evacuated after the incident.
The three women were trampled to death at about 04:00 local time on Thursday (03:00 GMT), Spanish police say.
Two of the victims were 18 years old, while the third was 25.
“There was a human crush at the only exit they had because the others were sealed off,” a partygoer – who gave her name as Sandra – told Spain’s Cadena Ser radio station.
A police investigation is currently under way.
The Halloween music party featured a number of well-known DJs.
The stampede recalled a mass panic at the Love Parade music festival in Germany that killed 21 people in 2010.