President Sirisena (right) and PM Ranil Wickremesinghe attend a commemoration ceremony. Ishara S. Kodikara/AFP
Sri Lankan President Maithripala Sirisena said a foreign mastermind may have planned the Easter Sunday bombings, claimed by Daesh, telling the militant group to "leave my country alone".
Sirisena also warned it may be possible Daesh had launched a "new strategy" by targeting smaller countries, Sky New said on Wednesday.
A government source told Reuters on Tuesday police and other security forces across the Buddhist-majority country had been ordered to remain on high alert because the militants were expected to try to strike again, before the holy month of Ramadan which starts on Monday.
Sirisena said authorities were aware of "a small group" of Sri Lankans who had travelled abroad to receive training from Daesh over the past decade.
Investigations revealed the bombs used in the Easter attacks were made locally, the president said in the interview.
The suicide bombings on hotels and churches killed more than 250 people, including 40 foreign nationals.
Police suspect members of two previously little-known groups - National Thawheedh Jamaath and Jammiyathul Millathu Ibrahim - of carrying out the attacks.
On Monday, Daesh’s media network published a video message purporting to come from its leader, Abu Bakr al-Baghdadi, which would be his first appearance since declaring the militants’ now-defunct "caliphate” five years ago.
In the video, a bearded man with Baghdadi’s appearance says the Sri Lanka bombings were Daesh's response to losses in its last territorial stronghold of Baghouz in Syria.
In the Sky News interview, Sirisena said he had a message for Daesh: "Leave my country alone."
Sri Lankan authorities have previously said that they suspect the attackers had international links, although the precise nature of those connections aren't known. The US Federal Bureau of Investigation and Interpol, as well as other undisclosed foreign agencies, are helping Sri Lanka with the probe.
Local intelligence officials believe that Zahran Hashim, a Tamil-speaking preacher from the east of the Indian Ocean island country, may have been a key player in plotting the Easter bombings. Officials believe he was one of nine suicide bombers.
Sri Lanka’s military launched a major hunt on Saturday for remnants of an extremist group which carried out the Easter suicide bombings that killed 258 people, officials said.
Daesh’s elusive supremo Abu Bakr al-Baghdadi made his first purported appearance in five years in a propaganda video released on Monday, acknowledging Daesh’s defeat in the Syrian town of Baghouz while threatening “revenge” attacks.
Sri Lanka President Maithripala Sirisena said on Saturday the security forces would “eradicate terrorism” following devastating suicide attacks on Easter Sunday and restore stability before a presidential election due by year-end.
The shootout between troops and suspected militants erupted on Friday evening in Sainthamaruthu in Ampara district, to the south of the town of Batticaloa, site of one of the Easter Sunday blasts at three churches and four luxury hotels.
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Protesters threw petrol bombs at the Tsim Sha Tsui police station on Kowloon peninsula after police inside fired volleys of tear gas to disperse demonstrators on the street.
Pakistan's army later said that "unprovoked cease-fire violations" by Indian troops killed five civilians and one soldier and wounded another three civilians and two troops across the highly militarized Line of Control that divides Kashmir between Pakistan and India.