Sri Lanka bombing: What is the National Thowfeek Jamaath, the Islamist group blamed for attacks?

As Sri Lanka’s authorities hunt down the perpetrators of the Easter Sunday massacre, their focus has centred on the National Thowheed Jamath, a little-known local fringe group who security experts say promote Islamist terrorist ideology but has no history of major attacks.

The country’s security agencies were warned two weeks before the atrocity about the possible targeting of churches, Rajitha Senaratne, the cabinet spokesman said on Monday.

“On 9 April, the chief of national intelligence wrote a letter and in this letter many of the names of the members of the terrorist organisation were written down,” he told reporters in Colombo.

Mr Senaratne added that the intelligence warning had named…