A suicide bomber has struck near a military base in the Afghan capital, Kabul.
Afghan and NATO officials said the blast went off outside Camp Phoenix, a US base on a road leading east out of the city centre.
There are reports that at least six people have been injured.
The BBC reports security has been tight in Kabul since a group of gunmen and bombers attacked the centre of the city on 18 January.
A statement from NATO said the explosion was outside the main gate of Camp Phoenix, and was most likely an improvised bomb hidden in a vehicle.
The interior ministry said five civilians had been wounded. There are no reports of any deaths.
In a text message to international news agencies, the Taliban claimed to have carried out the attack.