Four labourers were killed due to suffocation in a local factory in Hafizabad on Wednesday.

According to the police, Ghulam Mustafa, Jamaat Ali, Muhammad Nadeem, and Naseer Ahmad were sleeping after burning a heater in a room of the Five Star Sizing Factory at Kolo road in Hafizabad.

Police said that the smouldering coals filled the room with gas due to which all the labourers died on the spot.