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Gunmen have attacked vehicles on a road in eastern Afghanistan, taking at least 13 people off a bus and shooting them dead, the BBC reported, citing local officials.

Attahullah Khogyani, a spokesman for the provincial governor of Wardak, said the attackers targeted three vehicles.

No group has so far claimed responsibility for the attack south-west of the capital Kabul, which happened after midnight.

It comes as Afghan leader Ashraf Ghani holds talks in the US on security.

Thirteen people, including a woman, were shot dead when they were taken off the bus on the highway between Kabul and Kandahar by masked gunmen. Two others were critically injured, Afghanistan's Tolo news agency reported.

The gunmen picked their victims and shot them one by one, Mohammad Ali, the deputy governor of neighbouring Ghazni province, told AFP news agency.

For many years the Taliban have controlled much of the countryside in this area, but they have denied involvement and have vowed in a statement to try to find the attackers, reports the BBC's Afghanistan correspondent, David Loyn.