Witnesses are reporting two explosions have hit two churches in Sri Lanka on Easter Sunday, causing casualties among worshippers.

The first blast ripped through St. Anthony's Shrine in Colombo.

Alex Agileson who was in the vicinity says buildings in the surrounding area shook with the blast.

He says a number of injured were carried in ambulances.

A second explosion was reported at St. Sebastian's Church in Negombo, a Catholic majority town north of Colombo.

The church has appealed for help on its Facebook page.

Sri Lankan security officials say they are checking for details.