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Suicide blast wounds 12 north of Kabul
The attack happened as Afghan provincial authorities and U.S. forces were holding a weekly meeting inside the office of the governor of Parwan province in the local capital Charikar, one source who is a politician from the province told Reuters.
U.S. forces had blocked off the area in Charikar, 60 km (37 miles) north of Kabul, she said.
A U.S. military vehicle had been hit by the blast and was on fire, she added, but had no further details.
Two other sources from Charikar said at least 12 Afghans were wounded in the attack, part of a spate of rising violence this year in Afghanistan.
(Reporting by Sayed Salahuddin, Editing by Dean Yates)