At least 14 persons, including 13 firefighters, were injured as a factory building collapsed in Delhi’s Peeragarhi on Thursday, the fire department said.

One firefighter is still trapped in the rubble and efforts to rescue him are on.

Early Thursday a fire had broken out in the four-storey building. At least 35 fire tenders were rushed to the spot.

A call was received around 4:23 am about a fire in a factory at Udyog Nagar, Peeragarhi, and accordingly seven fire tenders were sent for rescue operations, said Atul Garg, Director, Delhi Fire Service. However, later due to a blast the building collapsed and several people, including fire brigade personnel, were trapped. Rescue operations are underway, he added.

Delhi chief minister Arvind Kejriwal expressed concern and said that he is monitoring the situation.