The U.S. Department of State has issued travel warnings about potential terrorist attacks for Americans who are traveling, or who are planning on traveling to Europe.

“The large number of tourists visiting Europe in the summer months will present greater targets for terrorists planning attacks in public locations, especially at large events,” the State Department wrote in the travel alert dated May 31, 2016.

The warning goes on to state possible events that terrorists might want to target:

France will host the European Soccer Championship from June 10 – July 10. Euro Cup stadiums, fan zones, and unaffiliated entertainment venues broadcasting the tournaments in France and across Europe represent potential targets for terrorists, as do other large-scale sporting events and public gathering places throughout Europe. France has extended its state of emergency through July 26 to cover the period of the soccer championship, as well as the Tour de France cycling race which will be held from July 2- 24. The Catholic Church’s World Youth Day event is expected to draw up to 2.5 million visitors to Krakow, Poland, between July 26 and July 31. U.S. citizens should be aware that local infrastructure may be strained due to the large number of visitors. Poland will impose border controls at all of its national borders from July 4 to August 2, and visitors to Poland during this period should be prepared to show their passport and undergo stricter security screening throughout Poland.

The warning comes on the after the terror attack in Paris in November 2015. Breitbart News provided extensive coverage of this terror event that left at least 26 people dead and many more injured.

The State Department provided the following advice for travelers:

Exercise vigilance when in public places or using mass transportation.

Be aware of immediate surroundings and avoid crowded places.

Follow the instructions of local authorities, especially in an emergency.

Monitor media and local event information sources and factor updated information into your travel plans and activities.

Be prepared for additional security screening and unexpected disruptions.

Stay in touch with your family, have a plan if you are separated and ensure they know how to reach you in the event of an emergency.

Bob Price serves as associate editor and senior political news contributor for Breitbart Texas and is a member of the original Breitbart Texas team. Follow him on Twitter @BobPriceBBTX.