Asadullah Ensafi, the deputy chief police of Ghazni province, said today that the bodies were found in Nawur district, which borders Pakistan.
He said three of the men were Hazara. The other was a Sunni Pashtun.
The Hazara are a largely Shiite ethnic minority in predominantly Sunni Afghanistan. The group has been targeted by the Taliban and other Sunni extremists in Afghanistan and neighboring Pakistan.
In February, 30 Hazara men were abducted in Zabul province, south of Ghazni. Last month, 11 Hazaras were kidnapped in northern Baghlan, which also has been plagued by militants since the Taliban stepped up their war against Kabul in April.