Police have registered a case against former Maharashtra Congress MLC Sanjay Dutt for allegedly beating up an ex-employee of his gas agency in Thane district, an official said on Wednesday.

The complainant, Deepak Nikalje (27), alleged that Dutt and his associates thrashed him and threatened him with dire consequences in Piswali area of Dombivli town on Sunday night, an official from Manpada police station said.