Sri Lankan Prime Minister Ranil Wickremesinghe has declared a state of emergency in his role as the acting president.
"The prime minister as acting president has declared a state of emergency (countrywide) and imposed a curfew in the western province," Wickremesinghe's media secretary, Dinouk Colombage, told Reuters.
The curfew comes into effect immediately.
It comes after President Gotabaya Rajapaksa fled to the Maldives on Wednesday, leading to more protests amid an economic crisis.

US halts flights at busy East Coast airports due to communications issues
MS NOW, CNN and Politico to sue over White House ban
Pakistan says it killed 28 militants, Afghan Taliban and UN report 3 civilian deaths
New air traffic control failure delays flights at UK airports
Textile factory fire in southern Chinese city of Foshan kills 8