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 military to begin Iran maritime blockade on Monday
Orban ousted after 16 years as Hungarians flock to pro-EU rival
Trump vows to blockade Strait of Hormuz after Iran peace talks stumble
Nigerian airstrike hits market, 200 feared dead
Russia, Ukraine trade accusations of ceasefire violations
