Dissident republican threat to police in north west 'severe'

The threat to the lives of police officers from dissident republicans in the north west of Northern Ireland remains severe, a senior officer has said.

Supt Mark McEwan outlined a number of incidents in recent months that demonstrated the threat.

He said that from September 2014 there had been 15 bomb incidents in the Derry City & Strabane District council area.

BBC News NI's Keiron Tourish reports.