Three labourers were killed on Tuesday when a boiler burst at a unit at Sankrail Industrial Park in Howrah district, police said.
The labourers were taking coal in the boiler when suddenly it burst this afternoon, a police officer said, adding they were declared dead at a nearby hospital.
Some other labourers, present at the site, were injured. However, the exact number is not known yet, the officer said.
The management of the unit and Industrial Park authorities were not available for comments.