Washington, Sha'ban 22, 1435, Jun 20, 2014, SPA -- The United States warns its citizens to be careful when travelling in Thailand. In a formal travel alert, the US State Department notes that martial law remains in effect and that the National Council for Peace and Order (NCPO) has "considerable security powers." It urges travellers to avoid protest sites and large gatherings, dpa reported. -- SPA 19:06 LOCAL TIME 16:06 GMT www.spa.gov.sa/w