"It is alarming to see reports that those suspected to be involved in the March 2018 anti-Muslim violence may have been involved in these recent attacks as well", she said.
Police said a curfew would be enforced until further notice in the country's North Western region, and until Tuesday morning in the rest of the nation. "It is no heroism in attacking Muslims and damaging their property - true heroism is to control and overcome oneself", he said.
Prime Minister Ranil Wickremesinghe said in a statement that acts of sabotage were hampering an investigation by security forces and warned that "if the racism rises up ... and peace is disturbed the country will be destabilized".
"I appeal to all citizens to remain calm and not be swayed by false information", Wickremesinghe said on Twitter, which was not targeted in the social media blockade. Dozens of people have been detained since the Easter Sunday attacks.
Amid the unrest, the Army fired shots in the air to disperse the mobs but the unrest spread to other towns, the Daily Mirror reported.
Muslims make up almost 10% of Sri Lanka's 22 million people, who are predominantly Sinhalese Buddhists.
The main body of Islamic clerics, the All Ceylon Jamiyyathul Ulama (ACJU), said there was increased suspicion of Muslims after the Easter Sunday killings.
Police arrested a group of men for the attacks but people in the mostly Buddhist district then demanded their release, military spokesman Sumith Atapattu said.
Tuesday marks the second day of the revenge attacks.
The interior of a vandalised shop after sectarian clashes in Minuwangoda, Sri Lanka, on May 14, 2019. The Islamic State group claimed responsibility for the attacks, which were carried out by a local radicalized Muslim group.
Internet service providers said they have been instructed by the telecommunications regulator to block access to Facebook, WhatsApp, YouTube and Instagram.
Sri Lankan software engineer Aadhil Ameez, a 24-year-old, has been tied to both the National Tawheed Jamaath (NTJ) and the Jamathei Millathu Ibrahim (JMI) who perpetrated the attacks which killed over 250 people and injured hundreds more.
Public schools completed their reopening after extended Easter holidays, but attendance was extremely low, according to education authorities.
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