The U.S. State Department warned about possible terrorist attacks in Barcelona during the holiday season.

“Exercise heightened caution around areas of vehicle movement, including buses, in the Las Ramblas area of Barcelona during Christmas and New Year’s,” the travel alert posted by State Department says.

#Spain: Exercise heightened caution around areas of vehicle movement, including buses, in the Las Ramblas area of Barcelona during Christmas and New Year’s. Terrorists may attack with little or no warning, targeting tourist locations, transportation hubs, and other public areas. pic.twitter.com/MPGiZwMwxq

— Travel - State Dept (@TravelGov) December 23, 2018