Three people have been injured in a blast at a factory in Jharmajri village in Himachal Pradesh`s Baddi-Barotiwala industrial area, officials said on Friday.

The incident, which took place on Thursday, came to light the following day when workers halted work in protest, shouting slogans at the gate over the lack of safety equipment and the management`s indifferent attitude towards their welfare. Sunil Thakur, Rajiv and a trainee sustained burn injuries in the incident. Sunil has been referred to PGI Chandigarh for treatment, the officials said.