Sri Lanka has imposed a night-time curfew across the country amid an upsurge in anti-Muslim violence.
Mosques and Muslim-owned shops have been targeted and local police say one man has been killed.
In several towns, police fired into the air and used tear gas to disperse hundreds of rioters.
Tensions have been high since Islamist militants attacked churches and hotels on Easter Sunday, killing more than 250 people.
Prime Minister Ranil Wickremesinghe has appealed for calm saying the current unrest was hampering the investigation into last month’s attacks in the early hours of Monday.
In the north-western town of Kiniyama, windows and doors to a mosque were smashed and copies of the Koran thrown on the floor.
The attack was triggered by a group of people demanding a search of the building after soldiers inspected a lake nearby looking for weapons, Reuters news agency reports.
