Three people were killed and several injured as the roof of a building collapsed at Baba Mukand Singh Naga on Daba Road here on Monday.
Deputy Commissioner Varinder Kumar Sharma and Commissioner of Police took stock of the situation after the under-construction roof of a factory collapsed.
NDRF, SDRF, MC and police teams are rescuing people.
Deputy Commissioner Varinder Kumar Sharma said 37 people were rescued and of them three had died. Four people are still feared trapped inside.
Ten people are undergoing treatment at the Civil and Apollo hospitals.
The construction work of the building was under way without permission. The factory owner was reportedly lifting the lintel level without the permission of the Municipal Corporation.
Workers of nearby factories said the lintel-lifting work had started around 4 am and the incident took place around 9.40 am.