Thai Prime Minister Abhisit Vejjajiva (back) walks towards his car as security officers gesture after Abhisit's car was stuck in traffic in Pattaya April 7, 2009. Protesters attacked a car carrying Vejjajiva on Tuesday as a minister warned that opposition elements wanted to cause chaos at a big rally this week in a bid to topple the government. Abhisit was unhurt, but a window in his car was smashed when a group of red-shirted demonstrators surrounded the vehicle in Pattaya. (REUTERS)

A policeman pulls a motorcycle blocking the car carrying Thai Prime Minister Abhisit Vejjajiva after he was stuck in traffic as supporters of former Thai Prime Minister Thaksin Shinawatra try to attack Abhisit in Pattaya April 7, 2009. (REUTERS)

Supporters of former Thai Prime Minister Thaksin Shinawatra scuffle with security men as they try to attack the car carrying Thai Prime Minister Abhisit Vejjajiva after he was stuck in a traffic in Pattaya April 7, 2009. (REUTERS)