Protests along the border with Afghanistan could jeopardize billions of dollars in aid to Islamabad, U.S. Defense Secretary Chuck Hagel warned.
Hagel met Monday with Pakistan's Prime Minister Nawaz Sharif to discuss security cooperation between the two nations.
Protests along a main crossing point have forced the United States to halt military shipments over concerns about the safety of the truckers. The protests are focusing on the CIA's drone program that has resulted in civilian casualties.
Pakistan said immediate action would be taken to resolve the shipment problem but no details were provided.