TOBA TEK SINGH: Three labourers were critically injured after roof of an under-construction animal shed caved in on them at Thakurwala located on Makkuana-Khurrianwala Road at Faisalabad on Monday. Rescue 1122 ambulances shifted them to Khurrianwala rural health centre. They were identified as Asghar (38), Mahmood (22) and Shafqat (42).