India, March 11 -- District authorities remained in the dark about the fatal wall collapse that left seven men dead at a construction site in Gurugram's Bilaspur for over two hours on Monday night and learned of the tragedy only after a hospital across the border in Rajasthan alerted them, officials said on Tuesday.

The incident took place around 7.30pm at a sewage treatment plant being constructed at an upcoming residential project. A concrete retention wall collapsed, triggering a soil cave-in that trapped workers.

Critically, no official at the site sent any alert or sought help from authorities, officials cited above said.

All seven deceased and four injured workers were taken to a government hospital in Bhiwadi, Rajasthan, approxi...