A brawl over a traffic accident on Gintota, about 110 kilometres south of the capital Colombo, on Thursday descended into clashes between mobs from the majority Sinhalese and minority Muslim minorities.
The army and navy were deployed to reinforce local police as the situation spiralled over the weekend with at least five people hospitalised and close to 90 buildings damaged in the rioting.
The town remained tense and under lockdown throughout last evening, but at dawn a curfew imposed on previous days was lifted.
Security forces and police would remain in place until law and order had been restored, he added.
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Muslims account for about 10 per cent of Sri Lanka's 21 million people, the second-largest minority group after Tamils.
Sinhalese -- a largely-Buddhist ethnic group -- make up more than 70 per cent of the population.
Police said 19 people have been arrested in connection with the weekend riots and the authorities were looking for more suspects.
In June 2014, there were religious riots between the majority Buddhists and minority Muslim leaving four dead and many injured.
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