Travel Warnings are issued to describe long-term, protracted conditions that make a country dangerous or unstable. A Travel Warning is also issued when the U.S. Government's ability to assist American citizens is constrained due to the closure of an embassy or consulate or because of a drawdown of its staff.
The latest Travel Warning for Pakistan, issued on February 5, 2014, is here.
The newest Worldwide Travel Alert can be found here.
For other countries, please see the Department's list of Current Travel Warnings.