A massive blast at an ammunition shop in Afghanistan's capital leveled shops and homes, killing at least six people and wounding around nine others.

Bystanders joined rescuers Wednesday to dig through the rubble of collapsed buildings in an attempt to find survivors.

Descriptions of the scope of the damage vary, with reports saying several to 25 buildings in Kabul were destroyed.

Police have not said what caused the blast in the ammunition store.

Also Wednesday, a suicide bomber in eastern Afghanistan blew himself up near a police convoy.

Police officers in Khost said at least four civilians were killed and more than 30 other people were injured, among them Afghan policemen.

Some information for this report was provided by AFP, AP and Reuters.