Inshaf Ahmed and Ilham Ahmed Ibrahim are said to be among those who carried out deadly attacks in Colombo last weekend.
It’s being called one of the bloodiest carnages since Sri Lanka's 25-year civil war ended a decade ago.
As Republican governors speak against resettling Syrian refugees in their states following the Paris terror attacks, presidential candidates Jeb Bush and Ted Cruz suggest that only the Christians among them should be allowed in.
A statement from Saudi Arabia's Ministry of the Interior said the arrests made during the past few weeks foiled a number of planned attacks.
After a series of suicide bombings unleashed by the extremist groups in recent weeks, President Muhammadu Buhari relieved the commanders.
The Islamic State claimed responsibility for the attack, which killed at least 126 people and injured many more. The bombers hit as the mosques were full of supporters of the Shia Houthi rebel movement attending Friday prayers.
A series of suicide bombings in northeast Nigeria involving young girls has led to speculation that the schoolgirls kidnapped by Boko Haram last year might be involved.