BANGKOK Nov 20 (Reuters) - A grenade attack on protesters occupying the Thai prime minister's office in Bangkok killed one protester and wounded 23 on Thursday, a spokesman for the People's Alliance for Democracy group said.

The Bangkok Post said on its website that an M-79 grenade had exploded near the main stage of the protest which began in late August.

(Reporting by Darren Schuettler; Editing by Sanjeev Miglani)

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