Continued existence of terrorist sanctuaries in Pakistan is a major impediment in fighting the Taliban in Afghanistan, America's top diplomat in Kabul has
lamented, asking Islamabad to take decisive action against safe havens.
US Ambassador to Afghanistan, Ryan Croker, said it was difficult for the Afghans and the NATO forces to decisively defeat an enemy who can take sanctuary and maintain its headquarters in another country.

"I think there's no question that the safe haven have been and remain a problem," Croker told the CNN in an interview. "We've been clear about that. We've been public about that. The Pakistani government needs to take action for their own sake as well as Afghanistan's and ours," the top American
diplomat said. 

According to The Washington Post, Crocker had recently sent a top secret cable to the US on the existence of terrorist safe havens in Pakistan.