Car bomb in centre of Cairo kills at least three

A car bomb attack has killed at least three people and injured dozens more close to the police headquarters in the centre of Cairo on Friday morning.

Egyptian state television quoted witnesses as saying that gunmen opened fire after the blast.

The explosion damaged the building and sent smoke rising over the city.

Egypt has been rocked by political violence since Islamist President Mohamed Mursi was ousted by the military in July last year.