The United States Embassy in Thailand alerted U.S. citizens that terrorists may be planning to conduct attacks in tourist areas in Bangkok in the near future.

“U.S. citizens are urged to exercise caution when visiting public areas where large groups of Western tourists gather in Bangkok,” the embassy said in an emergency message.

“U.S. citizens are encouraged to maintain a heightened awareness when out in public.”

Americans are encouraged to be alert for unattended packages in crowded places and report any suspicious behavior to the nearest law enforcement personnel.

They are also encouraged to “keep a low profile in public areas, particularly areas frequented by foreign tourists.”