DERA ISMAIL KHAN, Pakistan: Militants killed four men for allegedly providing the United States with information used in a recent drone attack that Pakistan claims killed many innocent civilians, Pakistani intelligence officials said Monday. Authorities found the bullet-riddled bodies of three Pakistanis and one Afghan in the North Waziristan tribal area with notes outlining their alleged role in the March 17 drone strike, said the officials, speaking on condition of anonymity because they were not authorized to talk to the media. The Pakistanis were found in the Datta Khel area where the attack occurred, while the Afghan was discovered near Mir Ali, one of the main towns in North Waziristan, said the officials. The notes found with the bodies warned that anyone who helps the US will face a similar fate, they said. Militants often kill alleged spies after drone attacks. Pakistani intelligence officials initially said the roughly three dozen people killed in last Thursday's drone attack were militants meeting in a compound to discuss sending additional insurgents to Afghanistan to fight foreign forces.