Eleven persons are feared killed as the basement of an under-construction building caved in Saturday evening at Jasola Vihar in south Delhi.

Three died immediately after the cave-in on Saturday. This happened 50 feet underground as rescuers were clearing rubble both manually and with machines.

"We have taken out two bodies from the debris, and can see three more," a fire fighter said on Saturday.

The cause of the collapse has been the weight of a large billboard strung across the under-construction building. Most of the trapped people were believed to be construction workers.

A team of 40 people, including police and fire brigade personnel, were engaged in rescue at the scene, police said.

Two injured people pulled out of the debris were sent to hospital.