Support WBURU.S., Pakistan At Impasse Over Afghan Supply RoutesPlay04:16Download AudioJackie NorthamMarch 15, 2012 ShareOil tankers sit at a NATO supply terminal in the southern Pakistani port city of Karachi on Feb. 9. In November, Pakistan's government shut down the main routes for bringing supplies to U.S. and NATO troops in Afghanistan. (Xinhua/Landov)