Thailand has issued an emergency decree banning protests as it clamps down on largely peaceful pro-democracy rallies that have also targeted the monarchy.
In a televised announcement the government said urgent measures were needed to “maintain peace and order”.
It justified the orders partly on the grounds of some protesters disturbing a royal motorcade during a mass march in Bangkok on Wednesday.
More than 20 people have been arrested including three protest leaders.
Thailand’s student-led democracy movement has been calling for the resignation of Prime Minister Prayuth Chan-ocha. The former army chief had seized power in a 2014 coup before he was appointed as premier after controversial elections last year.
The protests have widened in recent months to also call for curbs on the king’s powers.