The blasts -- one of the deadliest attacks in the country's history -- targeted St Anthony's Church in Colombo, St Sebastian's Church in the western coastal town of Negombo and Zion Church in the eastern town of Batticaloa around 8.45 am (local time) as the Easter Sunday mass were in progress.
The details of the attackers and their relatives linked to the bombings was released by the police on Wednesday.
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Seven persons had been arrested in connection with the blasts.