Sri Lankan housewife Fathima Fazla thought of her neighbors in the grand three-story home across the street as the wealthy celebrities of her humble Colombo suburb. She had no idea how infamous they would become.

Two brothers who lived at the white house on Mahawela Gardens have emerged as key players in suicide attacks on Easter Sunday that killed more than 350 people and stunned an island state that had enjoyed a decade of relative peace.

The Islamic State militant group claimed responsibility for the coordinated attacks on three churches and four hotels.