A terrorist alert for summer travelers to Europe.

FOX's Steve Taylor reports from Washington:

The State Department says large numbers of American tourists expected in Europe this summer mean more targets for terrorists.

A new travel alert singles out three events: the European Soccer Championships in June and July, the Tour de France and the Catholic Church's World Youth Day events in Poland, both in July.

The alert advises American travelers to keep their eyes and ears open, especially in public places; to be prepared for security delays; to stay in touch with family members and to have a plan if you get separated.

In Washington, Steve Taylor, FOX News.