The U.S. State Department said political demonstrations in Bangkok were expected to continue through the Songkran Thai New Year holidays from April 13-16.
It warned Americans to avoid areas where demonstrations were taking place, including Khao San road, a popular tourist street for budget travelers in the old town.
"U.S. citizens are reminded that even demonstrations intended to be peaceful can turn confrontational and escalate into violence with little or no warning," it said. "U.S. citizens are urged to avoid the areas that may be targeted for demonstrations and to exercise caution in their movements around Bangkok, Reuters informs.
According to Inquirer, seventeen civilians and four soldiers were killed and more than 800 people wounded in clashes Saturday between security forces and "Red Shirt" protesters in Bangkok.
China's foreign ministry said it was "deeply concerned" about the Thai tensions and called for a quick restoration of order.