Militants have killed four men, beheading two and dumping the bodies in Pakistan's northwest tribal belt after accusing them of spying for the United States, officials said Friday. The bodies were found by the side of a road in Khadi village, 25 kilometres (15 miles) east of Miranshah, the main town in the tribal North Waziristan region near the Afghan border, local police officer Kalam Khan told AFP. He said that two bodies were headless, while the remaining two had multiple bullet wounds. Two of the men were Afghans while the others were local tribesmen who had been kidnapped from Miranshah three weeks ago. A local intelligence official said that a note found near the bodies said "all those spying for the US and Pakistan will suffer the same fate". Militants frequently kidnap and kill tribesmen in the troubled region, accusing them of spying for the Pakistani government or US forces in Afghanistan, where Taliban fighters are waging an insurgency. A volley of bombing raids by unmanned US aircraft has also hit Paksitan's northwest in the past few months, most in North Waziristan, a bastion of Al-Qaeda fighters, the Taliban and Al-Qaeda linked militants.