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.

European leaders rally behind Greenland in face of renewed US threat
South Korea's Lee says he asked Xi to play a mediating role on North Korea
6.7-magnitude earthquake strikes near Baculin, Philippines
Israel, Syria to share intelligence following US-mediated talks
Maduro opponent Machado vows to return to Venezuela, wants election
