Colombo: A series of coordinated bombings on Easter Sunday has rocked churches and hotels in Sri Lanka.The death toll from a string of deadly suicide bomb attacks has risen to 310, with several people dying of their injuries overnight, a police spokesman said Tuesday.

Around 500 people were wounded in the blasts, Ruwan Gunasekera said in a statement.

Ruwan Gunasekera further added that 40 people were now under arrest in connection with the attacks, which Sri Lanka's government has blamed on a previously little-known local Islamist group, National Thowheeth Jama'ath.

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Accordinf to the reoorts, the blasts targeted four hotels - including the Shangri-La, Kingsbury and the Cinnamon Grand in the capital Colombo - as well as three churches. Nearly all victims were Sri Lankan. Dozens of foreigners were also killed.

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There were no claims of responsibility for the attacks but the cabinet spokesperson and health minister Rajitha Senaratne blamed the bombings on National Thowheeth Jama'ath, a little-known Muslim organisation.