Riots broke out in central Myanmar on Wednesday, authorities said, as police struggled to stop groups of Buddhists from setting fire to mosques and Muslims' homes.
The violence comes after a state of emergency was declared last week in the area where clashes between the two communities first broke out, leaving at least 40 people dead.
In Natalin township, rioters destroyed eight houses, 12 shops and one mosque, police said.
In nearby Zigon township, 40 houses and one mosque were destroyed, they said.
Police said they fired rubber bullets at rioters there. Some people were injured and admitted the hospital.
The riots prompted new restrictions.
Officials put dusk-to-dawn curfews in place in Natalin and Zigon, state-run TV reported late Wednesday, raising the total number of townships where a curfew is now imposed to nine.
Officials on Tuesday put curfews in place in the townships of Gyobingauk, Okpo and Minhla, the New Light of Myanmar, a state-run newspaper, said.
Police had reported arson attacks on Muslim properties in those three townships in recent days.
U.S. authorities have issued a warning to U.S. citizens in Myanmar amid the unrest that began last week in the city of Meiktila, in the central Mandalay region, and spread to other towns.
The situation has fueled fears in the commercial capital, Yangon, prompting stores to close in a popular shopping district Monday.
The U.S. Embassy told U.S. citizens to avoid the Mingalar Market and Yuzana Plaza part of Yangon, the same area where the stores were shuttered.
A state of emergency
During the clashes in Meiktila, which were reportedly set off by a dispute between a Muslim gold shop owner and two Buddhist sellers, rioters set fire to houses, schools and mosques, prompting thousands of residents to flee their homes.
The government declared a state of emergency in the city Friday, allowing the military to help reinstate order. But as the situation there appeared to calm, authorities reported arson attacks by groups of Buddhists in other towns in the region over the weekend.
The unrest highlights the fragility of ethnic relations in Myanmar, also known as Burma, as it emerges from decades of military repression. Authorities have released thousands of political prisoners and pursued peace talks with rebel groups in the past two years.
President Thein Sein, who has overseen the country's initial moves toward democracy, vowed Monday "to take action against those who led the violence and got involved in it and to expose those who flamed the conflict under the pretext of religion," the New Light of Myanmar reported.
The U.N. humanitarian agency says that the Myanmar government estimates that more than 12,000 people have been displaced by the unrest.
"They're barricaded in schools and in a monastery," said Ashok Nigam, the U.N. resident coordinator in Myanmar. "They're currently receiving humanitarian assistance provided by the government."
A Buddhist monk was reported to be among those killed when the violence initially erupted in Meiktila last week. But Win Htein, an opposition lawmaker for the area, has said that he believes the majority of the victims were Muslims.