State Department is warning Americans living in and traveling to Europe of the ongoing threat of terrorist attacks on the continent through the summer.
In a new travel alert issued on Monday, the department said ISIS, al-Qaeda and their affiliates retain the "ability and to plan and execute" attacks in Europe. It said the U.S. officials remain concerned about the potential for future attacks, following a series of strikes in France, Russia, Sweden and Britain.
The alert said U.S. citizens should be especially vigilant at large, high profile events, particularly during the summer travel season.
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The department's last terror alert for Europe was issued on November 21 last year and expired on February 20.
Monday's alert expires on September 1.