The alert, which does not suggest that people should cancel travel plans, notes that ISIS and other terrorist groups "continue to plan terrorist attacks in multiple regions,'' and advises travelers to exercise caution while in public places or using public transportation and to be aware of their surroundings.
The alert will remain in effect until Feb. 24.
According to the alert, terrorist groups "may employ a wide variety of tactics, using conventional and non-conventional weapons and targeting both official and private interests.''
"U.S. citizens should exercise vigilance when in public places or using transportation,'' according to the alert. "Be aware of immediate surroundings and avoid large crowds or crowded places. Exercise particular caution during the holiday season and at holiday festivals or events. U.S. citizens should monitor media and local information sources and factor updated information into personal travel plans and activities. Persons with specific safety concerns should contact local law enforcement authorities who are responsible for the safety and security of all visitors to their host country.''
The alert also advised travelers to be prepared for additional security screening and possible disruptions and to keep in touch with relatives to ensure they can make contact in the event of an emergency.