A 16-year-old boy was killed and three others were injured after the roof of a shop in Narela collapsed on them on Saturday, police said.
Officials of a hospital informed police at 11.30 am that three injured persons have been admitted.
During enquiry, it was found that four persons were working at the welding shop at Swatantra Nagar, Deputy Commissioner of Police (outer north) Gaurav Sharma said.
The roof, made of iron bars and metal sheets, collapsed when the workers were repairing its foundation for the construction of a drain by a contractor of the Irrigation and Flood Control Department, he said