Argentine families have began to bury relatives killed in a Buenos Aires nightclub fire that claimed at least 182 lives.

Officials say more than 700 other people were injured in the Thursday night blaze. Investigators say the fire may have been started when someone set off a flare, igniting the club's foam-covered ceiling. More than 2,000 people, mostly teenagers, tried to escape the blaze, but city officials say four of the exit doors were locked.

Investigators say they have identified three people believed to have launched the flare, but did not say if they were among the casualties.

Argentine officials add that they are looking into witness accounts that there was a makeshift nursery in one of the club's bathrooms.

On Saturday, hundreds of people marched near the club demanding that Buenos Aires officials toughen safety codes for concert halls and nightclubs.

Some information for this report provided by AP and AFP.