Democrat Party leader Abhisit Vejjajiva warned on Sunday of a bid to use a legal avenue to clear all obstacles for the return of former prime minister Thaksin Shinawatra, saying the move could lead to "civil war".
The opposition leader also demanded proof of the identities of two people whose voices are heard in an audio clip.
The clip, posted on YouTube on Saturday, was said to be a conversation between Thaksin and Deputy Defence Minister Yuthasak Sasiprapa in Singapore late last month. (Story continues below)
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