Police fired water cannon at anti-government protesters to prevent them from marching to the Royal Household Bureau at the Grand Palace in Bangkok on Sunday.
Authorities briefly used water cannon when the protesters reached the area outside the Supreme Court building at Sanam Luang on their way to give letters addressed to the bureau requesting reform of the monarchy.
Four red post boxes were placed on Ratchadamnoen Nai Avenue for protesters to "post" their letters to the King.
Police had set up a blockade outside the Supreme Court to prevent the demonstrators from advancing. After the water cannon was used, authorities said they would not fire again as long as protesters stayed away from the barricade.
The Erawan Medical Centre of the Bangkok Metropolitan Administration reported that one police officer and two protesters were slightly injured when the water cannon was fired.
Many angered demonstrators then moved to the open space at Sanam Luang. Their leaders on Sunday evening were negotiating with police teams to end the stalemate.
The decision to use water cannon came after police had warned protesters to stay at least 150m away from the building.
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