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.

Man charged with 10 counts of attempted murder after knife attack on UK train
Tanzania's Hassan sworn into office after deadly election violence
Powerful 6.3 quake kills at least 20 in Afghanistan, hundreds injured
Turkey set to call for action on Gaza as soon as possible, source says
Hamas hands over three more hostage bodies
India federal agency freezes Anil Ambani Group's $853 million properties
Israeli strike kills one in Gaza as sides trade blame for truce violations
UK police say mass stabbing on train not terrorist incident, two arrested
