The announcement reads in part:
"The U.S. Department of State alerts U.S. citizens traveling and residing abroad to the enhanced potential for anti-American violence given recent counterterrorism activity in Pakistan. Given the uncertainty and volatility of the current situation, U.S. citizens in areas where recent events could cause anti-American violence are strongly urged to limit their travel outside of their homes and hotels and avoid mass gatherings and demonstrations. U.S. citizens should stay current with media coverage of local events and be aware of their surroundings at all times."
Travelers were also cautioned that U.S. government operations abroad may be curtailed.
Government facilities "may temporarily close or periodically suspend public services to assess their security posture," the alert said, adding: "In those instances, U.S. embassies and consulates will make every effort to provide emergency services to U.S. citizens."
The alert also urged Americans to "keep in regular contact with family and friends" abroad.
For security updates, visit the State Department's website for travelers or call (888) 407-4747 toll-free in the U.S. or Canada; outside that area, you can call (202) 501-4444. The department may also post updates on Twitter and Facebook.