KABUL, Afghanistan — The Taliban ambushed a peace convoy in western Afghanistan and abducted 26 activists who are members of a peace movement, a police spokesman said on Wednesday.

The insurgents staged the ambush in the district of Bala Buluk in Farah province on Tuesday. The Taliban forced the six-vehicle convoy to a halt, then got into the cars and drove them and the activists to an unknown location, said Mohibullah Mohib, the provincial police spokesman.

According to Mr. Mohib, a police operation is underway to locate and free the activists whose convoy was going from village to village to rally for peace.

Bismillah Watandost of the People’s Peace Movement of Afghanistan, to which the activists belong, said that 27 of its members were abducted by the Taliban in the Farah assault. The different figures could not immediately be reconciled.