LONDON, Sept. 17 (UPI) -- British nationals are advised against traveling near large gatherings in Bangkok through Sunday as Red Shirt demonstrations could turn violent, London warned.
The British Foreign and Commonwealth Office said so-called Red Shirt protesters are preparing demonstrations in Bangkok and Chiang Mai to mark the anniversary of a 2006 coup.
The warning said demonstrations will end with gatherings Sunday in Bangkok.
"British nationals should avoid all demonstrations or large gatherings, which may turn violent," the warning stated. "There is also a risk of violent incidents, including bomb attacks, around this time, especially in Bangkok."
Bangkok remains under a state of emergency after the 10-week, anti-government Red Shirt protest ending in May left 89 people dead.
Prime Minister Abhisit Vejjajiva has ordered heightened security after intelligence reports warned of possible violence ahead of the planned gathering of the Red Shirts to protest the military coup.
Thai authorities said additional troops were being deployed in response to plans for a rally Sunday in Bangkok to mark the coup.
The May clashes between Red Shirt supporters and security forces left several people dead, including a breakaway general who was assassinated during a media interview amid the unrest.