On Tuesday, the United States Department of State sent a travel alert to American citizens warning of potential terrorist attacks in Europe this summer due to events that will draw large crowds.

According to FoxNews.com, the U.S. State Department believes the European soccer championships and the Tour de France bicycle race in France, as well as the Catholic Church’s World Youth Day in Krakow, Poland, could be targets for possible terrorist attacks.

The State Department issued the alert as the summer approaches and more citizens begin their vacations around the world. The large crowds at the sporting and religious events could provide an ideal target for terrorists.

“I’m not aware of any specific, credible terrorist threat around these events or in any particular place in Europe,” State Department spokesman John Kirby told FoxNews.com. “We took the opportunity because it’s the beginning of summer, to make our concerns known.”

While U.S. officials issued the travel alert, it is not as serious as a travel warning, which is indicative of higher-level threats. The last alert sent out by the State Department was in March following the terrorist attacks in Brussels.

Follow @Donald_Wood