The Taliban hanged a body from a crane in the main square of the city of Herat.
This was reported by a witness to the Associated Press, while some videos are being shot on the web.
Wazir Ahmad Seddiqi, who runs a pharmacy on the side of the square, explained that four bodies were brought to the scene and three were moved to other squares in the city for display.
They would have been captured during a kidnapping attempt and killed by the police.
In recent days, one of the Taliban leaders had announced a return to executions and hand amputations.