Seven people were killed after an LPG cylinder blast triggered a collapse bringing a portion of a building down in West Delhi's Sudarshan Park.
Work related to ceiling-fans was being carried out in the building when the incident occurred.
Around 15 were rescued and shifted to Acharya Bhikshu hospital.
Of them, seven died and four, who were critical, have been shifted to Safdarjung hospital.
Eight fire tenders were rushed to the spot
The fire department received a call about the collapse at around 8.48 pm yesterday and eight fire tenders, along with ambulances, were rushed to the spot, said the police official. The building comprises ground and first floors, said the police.
Building used as factory for painting ceiling fans
A few more persons are feared trapped under the debris, said the police.
The structure is located in a congested area and it was being used as a factory for painting ceiling fans.
The owner of the 'factory' was among the injured, they said.
Manish, who witnessed the tragedy unfold and also helped the team with rescue operations, said the building suffered partial damage.
Five-year-old child among the deceased, similar incident happened earlier too
"Fifteen persons were rescued and rushed to Acharya Bhikshu hospital in front of me," said Manish.
"Later, we got to know that six people including a five-year-old child died," he added.
A local resident Surender Jain said, "Three years ago, a similar incident had occurred in the nearby locality. It's a big market where work related to fans is carried out."
NDRF helping Delhi Fire Service team to rescue people
A case has been registered against the owner of the factory under relevant sections of the Indian Penal Code and the matter is being probed, Monika Bhardwaj, Deputy Commissioner of Police (West), said.
Along with police and a Delhi Fire Service team, a National Disaster Response Force (NDRF) team is also at the spot carrying out rescue operations in full swing, police said.