Acting President Wickremesinghe said that due to the incomplete nature of the Easter Sunday investigations he is requesting the assistance of the UK Government and their intelligence services, reports Daily Mirror.

On April 21, 2019, three churches in Negombo, Batticaloa and Colombo, and the hotels -- Shangri-La, Cinnamon Grand, Kingsbury, and Tropical Inn -- in the capital city were targeted in the series of coordinated suicide bombings, killling 259 people and also injured more than 500.

Sri Lankan authorities attributed the attacks to little-known local Islamist extremist groups, National Thowheeth Jama'ath, and Jammiyathul Millathu Ibrahim.

However, the Islamic State terror group claimed the attacks.