But even as the White House tried to mollify Pakistan, officials acknowledged that the uneasy allies faced looming tensions over a host of issues far larger than the airstrike and the subsequent closing of supply lines into Afghanistan.
American pressure to show progress in Afghanistan is translating into increased pressure on Pakistan to crack down on terrorist groups. It is also running up against Pakistan’s sensitivity about its sovereignty and its determination to play a crucial role in any reconciliation with the Taliban.
American and NATO officials said privately that the Pakistani government’s closing of a crucial border crossing might have made it easier for militants to attack backed-up tanker trucks carrying fuel through Pakistan to Afghanistan to support the American war effort.
Still, the unusual apologies, officials and outside analysts said, were intended to clear away the debris from the explosive events along the border, in hopes of maintaining Pakistani cooperation."