HAFLONG: Including three railway employees four persons were killed and several others injured when Dima Halam Daogah (Jewel) militants exploded a bomb at a railway station in South Assam's North Cachar Hills district late Monday night.

Official sources Tuesday said that the insurgents of the DHD(J), also known as the dreaded 'Black Widow', exploded a bomb in the Harangajao railway station, killing three railway employees on duty and a member of the public.

The exact number of the injured was being ascertained, the sources said.

The station was cordoned off and no trains were allowed to pass through it temporarily, they added.