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At least one person has been killed and three wounded by gunfire after clashes broke out between rival protesters in the Thai capital Bangkok.
People heading to a pro-government rally were attacked by students, and later shots were fired.
Saturday is the seventh day of protests aiming to unseat the government of Prime Minister Yingluck Shinawatra.
Protesters claim her government is controlled by her brother, exiled former leader Thaksin Shinawatra.
He was ousted in a coup following protests in 2006 and now lives in self-imposed exile overseas.
He is one of the most polarising figures in Thai politics - he remains popular with many rural voters, while his opponents tend to be urban and middle class voters.
On Saturday, what had been largely peaceful demonstrations turned violent outside a stadium where a pro-government rally has been confined during this week to avoid clashes with the anti-government protests moving around the city, the BBC's Jonathan Head reports from Bangkok.
A group of students attacked vehicles bringing government supporters to the stadium - windows were smashed, and some minor injuries reported.
Later, shots were fired, but it is not clear yet by whom.