According to the source, the brothers were sons of a wealthy spice trader. They carried out the suicide attacks while they were standing in a queue at the Shangri-La and Cinnamon Grand hotels in Colombo.
READ MORE: At Least 45 Children Killed in Sri Lanka Attacks — UNICEF
Apart from that, the news agency reported, citing sources familiar with the investigation, that another suicide bomber had tried to commit one more explosion at a hotel in Colombo on 21 April, but his plan failed, AFP reported.
Multiple explosions took place in Sri Lanka on Easter Sunday; three churches and three hotels were targeted; the blasts killed more than 300 people.
Sri Lankan authorities launched a massive security operation after the tragedy. At least 29 people were detained in connection with the attacks. Interpol announced Monday it would deploy a special team to Sri Lanka to investigate the waves of deadly bombings.