The Muslim groups had pointed out that since mid-April, over 20 incidents of violence, hate, intimidation and threats have been reported against Muslims and their places of worship.
In some cases there have been arson attacks against Muslim-owned businesses in several towns. No arrests of attackers has been made till date.
Sirisena asked Law and Order Minister Sagala Ratnayake to take stern action while Prime Minister Ranil Wickremesinghe said that respective area police must be held accountable for the incidents.
Its leader the Buddhist Monk, Galagodaatte Gnanasara is accused of issuing public threats on Muslims and verbally abusing Islam faith.
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"Any attack on a house of worship is reprehensible. I hope authorities arrest and try the perpetrators soonest," US Ambassador Atul Keshap tweeted.
"Attacks like this deserve condemnation," James Dauris, the British High Commissioner tweeted.
Gnanasara made a forceful entry to national integration minister Mano Ganesan's ministry last week and verbally confronted the minister, who is a minority Tamil.
The Secretariat for Muslims (SFM), a Muslim civil society organisation, has urged the government to deal with the situation and to ensure the rule of law.
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