Protests came in response to Thailand's Constitutional Court ruling that says demands for reforms to the monarchy are unconstitutional.
At least three protesters have been injured in what was the third such rally against Prime Minister Prayuth’s poor handling of the pandemic.
The standoff between anti-government demonstrators demanding constitutional reforms and royalist supporters of King has evoked fears of troubles similar to those that led to the 2014 coup.
King Vajiralongkorn, 66, became constitutional monarch after the death of his revered father, King Bhumibol Adulyadej, in October 2016 after 70 years on the throne. The coronation follows a period of mourning.
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