The U.S. ambassador to Thailand warned Friday there is a 'real and very credible' threat of a terrorist attack against American citizens in Bangkok, AP reported. Ambassador Kristie Kenney was elaborating on an 'emergency message' sent by the embassy to American citizens earlier Friday warning of a possible terrorist attack. The message said that 'foreign terrorists may be currently looking to conduct attacks against tourist areas in Bangkok in the near future.' It urged Americans to 'keep a low profile' in public and to exercise caution in areas where Western tourists gather. The statement gave no other details.