The blaze at the seven-storey site in the Indonesian capital started on Tuesday afternoon, according to city police chief Susatyo Purnomo Condro, who said some workers were having lunch at the time.
Police believe the fire began after a battery exploded on the first floor before the flames spread upwards. A company which makes drones is based in the building.
Susatyo said most of the victims who perished were women, one of whom was pregnant,and it was likely that they had died of asphyxiation from smoke rather than burns.
Thick smoke poured from the upper floors as firefighters deployed 28 engines and about 100 personnel, with dramatic footage showing trapped employees being rescued by aerial ladders.
Police believe the fire began after a battery exploded on the first floor before the flames spread upwards. A company which makes drones is based in the building.
Susatyo said most of the victims who perished were women, one of whom was pregnant,and it was likely that they had died of asphyxiation from smoke rather than burns.
Thick smoke poured from the upper floors as firefighters deployed 28 engines and about 100 personnel, with dramatic footage showing trapped employees being rescued by aerial ladders.
