Osama bin Laden and the Taliban received threats of possible American military strikes against them two months before the terrorist assaults on New York and Washington, which were allegedly masterminded by the Saudi-born fundamentalist, a Guardian investigation has established. The threats of war unless the Taliban surrendered Osama bin Laden were passed to the regime in Afghanistan by the Pakistani government, senior diplomatic sources revealed yesterday. The warning to the Taliban originated at a four-day meeting of senior Americans, Russians, Iranians and Pakistanis at a hotel in Berlin in mid-July. The conference, the third in a series dubbed brainstorming on Afghanistan", was part of a classic diplomatic device known as "track two". "The Americans indicated to us that in case the Taliban does not behave and in case Pakistan also doesn't help us to influence the Taliban, then the United States would be left with no option but to take an overt action against Afghanistan," said Niaz Naik, a former foreign minister of Pakistan, who was at the meeting. "I told the Pakistani government, who informed the Taliban via our foreign office and the Taliban ambassador here." The three Americans at the Berlin meeting were Tom Simons, a former US ambassador to Pakistan, Karl "Rick" Inderfurth, a former assistant secretary of state for south Asian affairs, and Lee Coldren, who headed the office of Pakistan, Afghan and Bangladesh affairs in the state department until 1997.