New Delhi: Four labourers were killed and 28 others injured on Friday after an explosion in the boiler of a chemical factory in Bahadurgarh town of Haryana’s Jhajjar district, located on the outskirts of Delhi. Rescue operations were conducted and firefighters have brought the blaze under control. However, there is a possibility of finding more bodies once the debris is cleared. Also Read - Three Killed, Several Injured in Blast at Lucknow's Oxygen Refilling Factory

The blast happened at the factory in MI Industrial area and spread to three buildings opposite to it that caught fire. Two other building adjacent to it also collapsed, Jhajjar Deputy Commissioner Jitender Dahiya told news agency PTI.

Among the injured are five children and 12 women, Dahiya said, adding that one of them was injured seriously and has been hospitalised. A team of the National Disaster Response Force (NDRF) and the district administration are making efforts to clear the debris of the buildings.

Following the tragedy, Haryana Chief Minister Manohar Lal Khattar announced an ex-gratia of Rs 2 lakh for the next of kin of the deceased. The cause of the explosion has not been ascertained so far and an investigation is underway.