Thousands of supporters of the United Front for Democracy against the Dictatorship (UDD), or the Red shirts, rally to commemorate the third anniversary of the military crackdown on the anti-government protesters in the main shopping district of Bangkok, capital of Thailand, May 19, 2013. (Xinhua/Gao Jianjun) 

Thousands of supporters of the United Front for Democracy against the Dictatorship (UDD), or the Red shirts, rally to commemorate the third anniversary of the military crackdown on the anti-government protesters in the main shopping district of Bangkok, capital of Thailand, May 19, 2013. (Xinhua/Gao Jianjun)

Thousands of supporters of the United Front for Democracy against the Dictatorship (UDD), or the Red shirts, rally to commemorate the third anniversary of the military crackdown on the anti-government protesters in the main shopping district of Bangkok, capital of Thailand, May 19, 2013. (Xinhua/Gao Jianjun)

Thousands of supporters of the United Front for Democracy against the Dictatorship (UDD), or the Red shirts, rally to commemorate the third anniversary of the military crackdown on the anti-government protesters in the main shopping district of Bangkok, capital of Thailand, May 19, 2013. (Xinhua/Gao Jianjun)

Thailand former prime minister Thaksin Shinawatra speaks to his supporters in screen via "Skype" during a rally in the central business district of Bangkok, Thailand, on May 19, 2013. At least 20,000 supporters of the United Front for Democracy against the Dictatorship (UDD), or the Red shirts, gathered in Bangkok on Sunday to commemorate the third anniversary of the military crackdown on the anti-government protesters. (Xinhua/Gao Jianjun)

Thailand former prime minister Thaksin Shinawatra speaks to his supporters in screen via "Skype" during a rally in the central business district of Bangkok, Thailand, on May 19, 2013. At least 20,000 supporters of the United Front for Democracy against the Dictatorship (UDD), or the Red shirts, gathered in Bangkok on Sunday to commemorate the third anniversary of the military crackdown on the anti-government protesters. (Xinhua/Gao Jianjun)