However, on Tuesday, the State Department announced a new alert that expires on August 31. Please note that the large number of tourists visiting Europe this summer present "greater targets" for terrorists planning attacks in public locations.
The State Department urges U.S. citizens to exercise vigilance in public places and when using mass transportation.
The alert specifically references several key events: the Euro Cup, hosted in France June 10–July 10; the Tour de France, from July 2–24; and the Catholic Church’s World Youth Day, which will draw an anticipated 2.5 million visitors to Krakow, Poland, between July 26 and July 31. The most likely sites are densely populated areas such as transportation, large festivals, religious and sporting events. No country is being singled out.
If you do travel, be aware of your surroundings and avoid crowded places. Crowds are difficult to avoid, especially if on vacation, but you can learn where to stand in the crowd and how to position yourself to limit your vulnerabilities. When you travel, select times when the airport is the least busy.