A Pro-government protester uses a sling shot towards Red shirt anti-government protesters as tensions rise between both sides at Silom street April 22, 2010 in Bangkok, Thailand. The army have vowed not to let the protesters move warning that they will use decisive measures to get control of the streets of downtown Bangkok. (Getty Images)

'Red Shirted' anti-government protesters react against the pro-government supporters (not in picture) on Silom Road in the financial district of central Bangkok in the early hours of April 22, 2010.