Halloween festivities turned deadly in Madrid early Thursday morning, when three women perished in a stampede at a holiday party, apparently prompted when an as-yet-unidentified reveler threw a flare into the crowd.
The massive Halloween party took place in a sports arena that can hold up to 10,000 people, said El Pais, although it's as yet unknown how many people were actually at the event.
"There was a human crush at the only exit they had because the others were sealed off," said one attendee to the Cadana Ser radio station, according to the BBC.
Read more from GlobalPost: Cambodia: More than 300 die in stampede
Ernesto Moreno Hernandez told El Pais that he "was in the plug that was formed. It was inhuman, and you could not move forward, because there were people lying on the floor. You couldn't move backwards, because people kept pushing. So we were there for half an hour."
EMT's swiftly arrived on the scene, but were unable to revive three of the women, who had gone into cardiac arrest, added El Pais.
Electronic music and eerie special effects were the draw for the Michael-Jackson themed Thriller Music Park event at the Madrid Arena, according to the event's website.
A police investigation is underway into the Halloween event, both to ascertain if the party was overbooked, and to determine if adequate security measures were in place.
Sadly, human stampedes are not uncommon: in November 2010, 300 people died in a stampede in Cambodia, when a water festival gathering turned deadly.