Hundreds of Sri Lankans prayed outside the bombed St Anthony's Church in Colombo on Tuesday to mark one month since the Easter Sunday attacks.
The special service was held even as the church, first built in 1740, was being restored following the bombing.
The anniversary also coincided with the partial reopening of Catholic schools after an extended Easter holiday.
The country's army chief said security forces would ensure schools were not targeted by the IS terror groups.

Two killed, 14 injured in bomb explosion inside a passenger bus near Damascus
Thai teen kills 8 in rampage at home and school before shooting himself
Morocco to cooperate on return of minors from Spain after Ceuta crossing
North Korea fires short-range ballistic missile, South Korea says
Wildfire prompts evacuation alert in metro Vancouver
