The JJ Marg police registered an accidental death report (ADR) after four labourers suffocated to death while cleaning a water tank in an under-construction building, Bismillah Space, in Nagpada, Byculla on Sunday. The workers’ families alleged that they had not been provided safety equipment.

The deceased have been identified as Hasibul Shaikh, 19; Raja Shaikh, 20; Jiyaul Shaikh, 36; and Imandar Shaikh, 38. One of their colleagues, Butan Shaikh, 31, who arrived at the spot after the quartet, survived.