New DELHI: The incident took place in a residential area of Noida Sector 21, where some construction workers were doing drainage system repair work, when suddenly a part of the boundary wall of the society collapsed. Due to which four workers lost their lives and twelve workers were trapped under the debris were pulled out after bulldozers were pressed into action at Jal Vayu Vihar, Noida, bulldozers were pressed into action at Jal Vayu Vihar.”Rescue and relief measures have been launched. Fire department personnel and police, including senior officers, are at the spot,” news agency PTI quoted a police officer as saying soon after the incident. “Rescue operation is underway. Details of the injured people are being ascertained. The area is being searched as a precautionary measure. The district magistrate said that the Noida development authority said that when labourers were pulling out bricks, the wall collapsed. It will be investigated,”Chief Minister Yogi Adityanath has expressed his condolences. On receiving information about the wall collapse, he asked senior officers to reach the spot immediately and start relief work on a war footing, the his office tweeted. The Chief Minister has also directed officials to ensure proper treatment of those injured in the incident.