No group has yet claimed responsibility for the attack which killed 290 people.
Islamic State supporters are celebrating the Sri Lanka suicide bombings which killed 290 people on Easter Sunday and left around another 500 injured.
The SITE Intelligence Group, which tracks extremist activity online, said ISIS fanatics were praising the terror attacks as revenge for the Christchurch mosques shooting.
No group has officially claimed responsibility for the blasts at five-star hotels and churches but Sri Lankan police say a previously unknown Muslim extremist group were the subject of an intelligence warning ten days before.
Early evidence points towards Islamist group National Thowheed Jamaath (NTJ), according to intelligence chiefs, who warn that more attacks are expected.
Rita Katz, director of respected terror monitoring SITE Intelligence Group, said IS supporters have applauded the attacks on social media, ‘celebrating casualties’.