OKARA(National times)- At least two labourers were killed when boiler of a private factory located at the Dipalpur Road in Okara exploded on Thursday, Dunya News reported. According to details, the labourers were working in the factory when the boiler suddenly exploded, as a result two labourers died on the spot. On receiving the information, rescue teams immediately reached the spot, and started relief operations. Police and administrative officials also arrived at the scene and have begun investigation after collecting evidences.