WASHINGTON — State Department is warning Americans living in and travelling to Europe of the ongoing ****** of ********* ******* on the continent through the summer.

In a new travel alert issued on Monday, the department said the Islamic State group, al-Qaida and their affiliates retain the “ability and to plan and execute” ******* in Europe. It said the U.S. officials remain concerned about the potential for future *******, following a series of strikes in France, ******, Sweden and *******.

The alert said U.S. citizens should be especially vigilant at large, high profile events, particularly during the summer travel season.

The department’s last ****** alert for Europe was issued on ******** 21 last year and expired on February 20.

Monday’s alert expires on September 1.