A fire at an office building in Jakarta has killed at least 22 people as authorities continue to search for casualties, BBC reported. 

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, according to BBC.