Taliban militants killed two men in Pakistan's lawless tribal belt bordering Afghanistan after accusing them of spying for the United States, a local official said Monday. The incident in North Waziristan was the latest in a string of at least 10 similar killings during the past two weeks in the region, known as a stronghold of Al-Qaeda and Taliban insurgents. The bullet-riddled bodies of two brothers, 25-year-old Rehman Rauf Khattak and 30-year-old Asfandyar Khattak, were found early Monday in a market in the town of Mir Ali, the official told. He said the two brothers had been kidnapped a week ago from Miranshah, the main town in North Waziristan. "The killers left a note with the bodies saying, "The two men were spying for the US," the official said. He added that 10-rupee notes had been stuffed into the mouths of the two men, apparently to "tell residents of Mir Ali that they were spying for money."