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The "terrorists" the prime minister said instigated the bloodshed on Saturday night are malcontent soldiers intent on bringing down the government, UDD leader Natthawut Saikua said on Tuesday.
He said the government should find and arrest them.
Prime Minister Abhisit Vejjajiva said on Monday the government had evidence that "armed terrorists" aiming to bring down his government were among the red-shirt protesters on Saturday.
He said they instigated the bloodshed that resulted in 21 deaths and more than 800 people injured.
Deputy Prime MInister Suthep Thaugsuban also accused unidentified armed men of causing the chaos.
"The terrorists the government claimed [were there] are soldiers who do not accept the current administration, causing conflict within the army," Mr Natthawut said.
"They used the opportunity on Saturday to create unrest."
He did not identify them, or offer to help with their arrest.