Officials are allegedly concerned that the jihadi fighters, who were ousted from their last stronghold Baghouz in eastern Syria last month, now have a free hand in orchestrating attacks at holiday resorts.
It is understood that such popular destinations as India, the Maldives, and resorts in Kenya and Tanzania are among the most likely targets.
"It is fantastic that the caliphate has been destroyed but in the short to medium term that creates a problem with Isil fighters dispersing around the world and seeking to carry out attacks to promote the Isil message", a source was quoted as saying.
It is also thought that the Sri Lankan suicide bombers were in contact with Daesh leaders in Iraq and that two of them had travelled to Syria.
Daesh has claimed responsibility for the Easter attacks on several churches and hotels in Sri Lanka, identifying the seven suicide bombers. Local authorities, meanwhile, have blamed them on a small Sri Lankan Islamist group, National Thowheed Jamath (NTJ).
Sri Lanka has reportedly arrested over 100 suspects in connection with the bombings, while the government banned and seized the assets of the NTJ and Jamathei Millathu Ibrahim (JMI), another group suspected of orchestrating the attacks.
Initial reports suggested that the series of explosions killed 359 people, but the government has recently revised the death toll down to 253. Sri Lankan authorities have acknowledged that security agencies mishandled intelligence related to the potential bombings. The country's defence chief stepped down earlier this week, taking responsibility for what happened on 21 April.
Photo source: picture from an open source