The Sri Lankan government has said a small Islamist extremist group known as National Thowheed Jamath is likely responsible for a terror attack that killed at least 290 people. The attack was carried out by several suicide bombers that let off explosives in churches and hotels across the country. Asha Castleberry — a national and foreign policy expert as well as a former member of the State Department mission to the United Nations — joins CBSN to discuss the connection between the extremist group and the terror attack.
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