Three young women died and two other people are in critical condition after suffering cardiorespiratory collapse during a stampede at a big Halloween party in Madrid, first responders told Efe.

Paramedics received a call at 4:05 a.m. Thursday to attend to several people between 18 and 25 years of age who were in respiratory arrest after being crushed, possibly after they fell down and were trampled in a large crowd of partygoers.

Two of the girls were pronounced dead at the nearby first aid station after emergency teams spent more than 30 minutes trying to revive them and a third was dead on arrival at a local hospital.