WANA: Pro-Taliban militants in Pakistan warned on Saturday that they would behead around 30 tribal elders if "they continued spying for US forces in Afghanistan", said officials. "This is the last warning. They must stop spying for the Americans or we will behead them," read a letter distributed in the border town of Angoor Ada in South Waziristan, an official said. "We have done it in the past and we can do it in the future also," read the letter, which listed the names of several tribes, according to the official. Several tribesmen have been shot dead or beheaded this year for allegedly spying for US-led forces in Afghanistan, or supporting Pakistan's campaign against Al Qaeda and other militants in the area. The warning came two weeks after militants shot dead a tribesman in Angoor Ada after accusing him of spying for US troops.