Suicide bombers have stormed the compound of an American aid organisation in northern Afghanistan, killing at least four people.
The attack came hours before the new United States commander of Nato-led forces in Afghanistan, General David Petraeus, was expected to arrive in the country.
The ABC reports that the bombers struck just before dawn at the offices of US aid group Development Alternatives in the northern Afghan province of Kunduz.
The first bomber blew himself up at the entrance of the compound, while another detonated his explosives inside the main building.
A gunbattle followed between the terrorists and Afghan police.
Taliban claim responsibility
Northern Kunduz province governor Mohammad Omar says police managed to kill two of the militants before they could detonate their explosives.
He says that about 20 people, including police officers, are believed to have been injured.
The Taliban have claimed responsibility for the attack.
The United Nations announced last week that it will withdraw some of its foreign staff from Afghanistan because of the growing number of threats towards United Nations staff and aid groups.