Thirteen firefighters were among the 14 people injured when a battery factory collapsed in northwest Delhi's Peera Garhi following an explosion due to a fire that broke out early on Thursday morning, officials said.
A fire brigade personnel still remained trapped under the debris of the building in Udyog Nagar area, an official said.
A large portion of the two-storey building collapsed following an explosion when firefighters were dousing the blaze, the official said, adding that fire department had received a call at 4.23 am.
Plumes of smoke billowed out from the building as the fire brigade personnel battled to contain the blaze. An eyewitness said several explosions were heard as the blaze gutted down the building.
The National Disaster Response Force and civil authorities rushed to the spot to control the situation, an official said, adding that 35 fire tenders were at the spot.
The injured, including a security guard of the factory, were rushed to nearby hospitals, a police officer said.
Chief Minister Arvind Kejriwal said he was monitoring the situation.
"V sad to hear this. Am closely monitoring the situation. Fire personnel trying their best. Praying for the safety of those trapped," Kejriwal tweeted.