Nineteen policemen were injured and 12 of their vehicles damaged when they tried to control attack on employees of a steel company by over 100 members of a labour union in Palghar, an official said on Sunday.

The police have so far arrested 27 people in connection with the incident that took place on Saturday in the company`s factory premises located in an industrial area in Boisar town of Palghar district, they said. Heavy security has been deployed in the premises. The situation there is tense, but under control, Palghar police spokesperson Sachin Navadkar said.