MADRID — Officials say three women have been killed and two injured in a stampede during a large Halloween Night party at a Madrid indoor venue.

Emergency services spokesman Fernando Prado said the women, aged between 18-25 years old, suffered trauma injuries and heart failure compatible with having been crushed during a stampede.

Th incident occurred after a flare was reportedly set off within Madrid Arena in the west of the city, where thousands of people were partying.

The two injured women were in critical condition, Prado said.

Halloween has recently become a popular festivity in Spain coinciding with the traditional feast of All Souls.