U.S. warns of possible "terrorist" attack on Bangkok
Walter Braunohler, spokesman at the embassy, declined to give further details but said: "We're warning all U.S. citizens to take caution when visiting public areas where Western tourists are known to gather in Bangkok."
Bangkok, a magnet for tourists with its vibrant nightlife and a transit point for those heading for Thailand's beaches, has faced political turmoil in recent years but threats of foreign attacks are rare.
(Reporting by Sinsiri Tiwutanond. Editing by Alan Raybould and Jason Szep)