border attack that killed 24 soldiers, could end support for the US-led war on militancy if its sovereignty is violated again, the foreign minister said, adding “enough is enough”. The South Asian nation has already shown its anger over the weekend strike by pulling out of an international conference in Germany next week on Afghanistan, depriving the talks of a central player in efforts to bring peace to its neighbor. “Enough is enough. The government will not tolerate any incident of spilling even a single drop of any civilian or soldier's blood,” The News newspaper on Thursday quoted Foreign Minister Hina Rabbani Khar as telling a Senate committee on foreign affairs. “Pakistan's role in the war on terror must not be overlooked,” Khar said, suggesting Pakistan could end its support for the U.S. war on militancy. Despite opposition at home, Islamabad backed Washington after the Sept. 11, 2001, attacks on the United States. In a development likely to exacerbate the crisis, two Pakistani men were killed in Afghanistan early on Thursday and Pakistani border guards said NATO may have been responsible. The officials said the two men, who were from the town of Chagai in the Pakistani province of Baluchistan, were gathering wood 30 km (18.6 miles) inside Afghanistan. They said NATO helicopters fired on their vehicle. “I can confirm that the bodies of two residents of Chagai have arrived from Afghanistan,” said Chagai Assistant Commissioner Tufail Baloch. “But I do not have any information on how they were killed. It happened on Afghan soil so we don't have many details yet.” NATO officials had no immediate comment. NATO helicopters and fighter jets attacked two military border posts in northwest Pakistan on Saturday in the worst incident of its kind since 2001. The top US military officer denied allegations by a senior Pakistani army official that the NATO attack was a deliberate act of aggression. General Martin Dempsey, chairman of the US military's Joint Chiefs of Staff, told Reuters in an interview: “The one thing I will say publicly and categorically is that this was not a deliberate attack.” The incident has given the army, which has ruled Pakistan for more than half of its history and sets security and foreign policy, some breathing room after facing strong criticism from both the Pakistani public and the US after Osama Bin Laden was killed in a secret raid by US special forces in May.