The death toll in Sri Lanka has soared to 290 after a wave of blasts hit churches and luxury hotels across the country on Sunday.

Police said 24 people had been arrested, but it is not yet known who carried out the attacks.

About 500 people are injured and at least 35 foreigners are among the dead.

The Easter Sunday bombings were the deadliest violence Sri Lanka has witnessed since the end of the country's civil war in 2009.