Gurgaon Police Commissioner Alok Mittal said that "the incident took place last night when around 10 labourers were taking bath under a huge water tank near a construction site of the DLF Group at Sector 90".
While three labourers died on the spot, and two injured were rushed to a hospital. One succumbed to his injuries at the hospital later, Mittal said.
Police have lodged an FIR against the contractor of the site and a hunt is on to nab him.