BANGKOK — The leader of a Redshirt security unit has disputed an allegation that he was behind the deadly grenade attack on rival anti-government protesters in Bangkok earlier this year.

The police recently arrested four men in the connection with the 23 February attack, in which unknown assailants launched a grenade at the rally site of the anti-government People’s Committee for Absolute Democracy With the King As Head of State (PCAD) at Ratchaprasong Intersection.

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