The United States has urged Pakistan and Afghanistan to cooperate in their counter-terrorism operations.
Addressing media briefing in Washington, State Department spokesman Mark Toner said their joint efforts are the only means to contribute to regional stability.
PIA Air Crash: Chairman PIA press briefing
The spokesman expressed grief over the loss of lives in the PIA plane crash. He said the US Embassy in Islamabad is in touch with Pakistani authorities regarding any assistance in connection with the tragic crash.