Three more Afghan civilians have been killed in the assault on a southern Taliban stronghold, Nato forces said today.

An enormous bomb ripped through a police academy bus in a crowded area of Kabul today, killing more than 35 people and wounding 35 others in the deadliest insurgent attack in Afghanistan since the US-led invasion in 2001.

A bomb ripped through a police bus in a crowded civilian area in Afghanistan this morning, leaving about 30 people dead or wounded, an official and witnesses said.