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Napisa said there could be angry reactions to the ruling going in Prayut's favor.
"I think there will be protests in the street and demonstrations in Bangkok against the ruling."
At least three protest groups -- which came to prominence during 2020's massive pro-democracy rallies -- said Thursday they would demonstrate should Prayut carry the day.
Deputy national police spokesman Kissana Phathanacharoen told AFP officers would be deployed to provide security near the court and in Bangkok's shopping mall district, a popular location for previous protests.
Meanwhile, officials announced late Thursday there would be a restricted zone around the court.
Source: Agence France-Presse
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