The State Department issued a warning this week to U.S. citizens traveling in Europe.
Recent incidents in France, Russia, Sweden and the U.K. were cited as reasons for the updated warning.
The last travel alert for American citizens expired in February. No new reasons were given for the updated warning.
According to the Daily Mail the statement stated: “US citizens should always be alert to the possibility that terrorist sympathizers or self-radicalized extremists may conduct attacks with little or no warning.”
In addition to the warning, travelers were also advised to expect delays during security screenings and delayed flights. U.S. citizens are advised to register with the State Department’s Smart Traveler Enrollment Program (STEP) before traveling overseas.
The alert comes just six days before the general election in France next weekend.