A convoy carrying UN foreign and national staff has been attacked in southeastern Afghanistan but there was no immediate report of any casualties, a top official in the area said.
Armed men stormed the convoy after it was hit by an explosion on a highway between the provinces of Khost and Paktia, Haji Assadullah Wafa, the governor of Paktia said.
"This incident happened around lunch time in an area called Gerdi Sari. We have sent troops to the area to find out what is going on and see if there are any casualties," he said.
Wafa blamed Afghanistan's "enemies" for being behind the attack. Afghans usually use the term "enemy" or "terrorist" for members of ousted Taliban and their al-Qaeda allies.