Suicide bombers hit Afghan city

Suicide bombers have attacked the police chief's office in Khost, eastern Afghanistan, as suspected Taliban fighters confronted security forces.

Heavy gunfire and explosions were also heard near the main police station, attorney general's office, courts and a local bank branch, witnesses said.

There were reports of casualties, and the battle was said to be going on.

It comes amid a spike of violence ahead of elections on 20 August, and follows recent provincial attacks by Taliban.