Around 20 people were injured late Saturday in Paris after the fifth floor of a building collapsed onto the fourth, broadcaster BFMTV reported.
The fifth floor of the six-story building collapsed during a party attended by around 50 people.
One of the 20 people injured was seriously hurt after being found buried by firefighters and in cardiac arrest.
The building and the two adjoining ones were evacuated.
In total, 125 firefighters and around 40 vehicles were deployed for the operation.
