It is "quite possible" that a "foreign mastermind" planned the deadly attacks in Sri Lanka, Sri Lankan President Maithripala Sirisena told Sky News.
The president has also stated that it may be possible that the terrorist group Daesh (also known as ISIL or ISIS) has started a "new strategy" by beginning to target smaller countries.
The statement comes days after Sri Lanka reimposed a two-day curfew in the territories surrounding the country's eastern city of Kalmunai, which was hit by three bombings on 26 April, Sputnik reported.
Sri Lanka's first nationwide, week-long curfew this year was imposed on 21 April, the day of a series of deadly Easter bombings which killed hundreds of people and injured hundreds more across the country. Afterwards, the curfew was re-imposed on a daily basis.
The international terrorist group Daesh has reportedly claimed responsibility for the attacks. Sri Lanka launched a criminal investigation into the attacks and has already arrested over 100 suspects. According to prosecutors, nine suicide bombers carried out the attacks, eight of whom have already been identified.