Three workers were killed and as many injured after an air-conditioner compressor exploded at Rashtriya Chemicals and Fertilisers (RCF) plant at Alibag in adjoining Raigad district on Wednesday evening, a police official said.

According to the Raigad police official, a group of workers was repairing an air conditioner at the RCF unit at Thal in Alibag, located about 100km from Mumbai, when suddenly a blast occurred in the AC compressor at around 4.45 pm.