"Current information suggests that ISIL (aka Da'esh), al-Qa'ida, Boko Haram, and other terrorist groups continue to plan terrorist attacks in multiple regions.  These attacks may employ a wide variety of tactics, using conventional and non-conventional weapons and targeting both official and private interests.  This Travel Alert expires on February 24, 2016."

Extremists have attacked in France, Nigeria, Denmark, Turkey and Mali and IS has claimed responsibility for bombing a Russian airliner in Egypt.

U.S. citizens are advised to be vigilant in public places and on transportation and avoid large crowds, including holiday events or festivals.

Read the full alert here.

Follow security alerts through the State Department’s social media:

The Associated Press contributed to this report.

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Scott Jackson (right), business service consultant for WorkSource Fulton, helps job seekers with their applications in a mobile career center at a job fair hosted by Goodwill Career Center in Atlanta. (Ziyu Julian Zhu/AJC)

Credit: Ziyu Julian Zhu/AJC