Taliban rebels are still crossing the border from Pakistan to attack targets in Afghanistan and the two key US allies must boost cooperation to stop them, an Afghan spokesman said on Tuesday. The comments come ahead of a planned meeting between Afghan President Hamid Karzai and his Pakistani counterpart Pervez Musharraf in Turkey late this month to resolve months of bad blood over the insurgency. “Afghanistan’s problem is clear. Terrorists are crossing the border from the other side of the border and carry out sabotage operations. They’re active there,” Afghan President Hamid Karzai’s chief spokesman Karim Rahimi told a news conference.