Four civilians have been killed in a bomb attack aimed at a convoy of US forces in Afghanistan’s eastern Province of Khost, Press TV reports.
The incident occurred on Thursday when an explosive-laden motorcycle detonated on the Khost-Gardez highway, an Afghan security official said on condition of anonymity.
There were no immediate reports on the possible casualties of US or Afghan forces in the explosion.
The US military has yet to comment on the attack.
The blast comes one day after bomb explosions in the southern Helmand Province claimed the lives of six people, including two policemen.
On October 2, the United Nations reported a 16 percent jump in the civilian death toll in Afghanistan in the first eight months of 2013.
An earlier UN report said that some 1,300 Afghan civilians were killed and more than 2,500 wounded in the first half of 2013. Most of the fatalities occurred during the militant attacks.
Afghanistan remains grappling with insecurity, over a decade into the US-led invasion of the country in 2001.