A suicide bomber has struck a convoy of foreign troops travelling on a road outside the Afghan city of Kandahar.
Two Nato soldiers were slightly injured in the attack, which took place along a main road leading to a Nato base.
There were no reports of civilian casualties caused by the explosion, which happened near a small market.
Nato forces, made up of 31,000 international troops, are facing increasingly stiff resistance from Taleban fighters in the south and east.
Nato has not yet provided details of the nationality of the troops injured in the attack.
Canadian soldiers make up the bulk of the deployment in that area.
Both injured soldiers were flown away from the scene of the blast by helicopter soon after the attack.
The blast is the latest in a wave of attacks targeting Nato and foreign forces.
On Tuesday, three Nato soldiers were killed when a roadside bomb hit their convoy in Nuristan, in the east of the country.
The alliance's top commander in Afghanistan, Lt Gen David Richards, told the Financial Times newspaper that he did not have enough forces to defeat the Taleban within six months.
However he added that he had enough troops to make "sufficient improvements" to keep Afghans confident in the government and international troops.