A wave of bombings that killed 290 people in Sri Lanka on Sunday was carried out with the support of an international network, officials said.
The government has blamed a little-known local jihadist group, National Thowheed Jamath, although no-one has yet admitted carrying out the bombings.
Another 500 people were injured in the suicide attacks on churches and hotels.
Police arrested 24 people in a series of raids and the president's office declared a state of national emergency.
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