http://www.foxnews.com/politics/2015...vel-alert.html

Authorities believe the likelihood of terror attacks will continue as members of ISIS return from Iraq and Syria, as well as the threat from “unaffiliated persons” planning attacks inspired by major terrorist organizations.

The State Department said that U.S. citizens should “exercise vigilance when in public places or using transportation” and “avoid large crowds or crowded places.”

Americans are also urged to exercise particular caution during the holiday season, and at holiday festivals or events. The worldwide travel alert expires on Feb. 24, 2016.