Forensic experts are carrying out the first autopsies of victims of a nightclub fire in the Romanian capital, where 27 people were killed and 180 injured.

The national prosecutors' office said autopsies would be conducted Sunday on the bodies of some of those who died as they fled a fire and ended up in a panicked stampede Friday night toward the only door in the basement nightclub Colectiv in downtown Bucharest.

Witnesses say the fire erupted after a spark on stage from a heavy metal pyrotechnics show ignited foam decor.

Some 146 people are still hospitalized around the Romanian capital. Doctors say 35 of them are in serious condition.

Authorities are still collecting evidence from the scene.

On Saturday, the government decreed three days of mourning.