Police in the Libyan capital, Tripoli, say 400 inmates have escaped from a prison in the city, where fighting continues between rival militias.

A police spokesman said the inmates rioted as the sound of clashes outside the prison intensified.

He said the prisoners forced open the doors and the guards then allowed them to leave, fearing for their lives.

In another part of Tripoli, two brothers were killed by a rocket which hit a camp for displaced people.

Libya's UN-backed government has declared a state of emergency in Tripoli after a week of clashes in which dozens of people have been killed, including civilians.