Archbishop Eamon Martin has called for prayers for those killed and injured in last night’s terrorist attack in Nice, France.
Police have now confirmed 84 dead. Eighteen other people are in a critical condition in hospital.
Paddy Mullan, from the North, witnessed the horrific attack.
Children were among the dead after a lorry slammed through a crowd celebrating Bastille Day.
The driver ploughed on for 2km (1.2 miles) on the Promenade des Anglais at about 23:00 local time, before being shot dead by police.
Witnesses say the speeding lorry swerved and zigzagged in an apparent attempt to hit more people.
Police reportedly found guns and grenades inside the lorry.
President Francois Hollande said the attack was of “an undeniable terrorist nature”.
Paddy Mullan, from Northern Ireland, witnessed the attack and told the BBC he had “never seen” such fear.
He said the truck “came out nowhere” and started “ploughing” into the crowd.
“This lorry just mounted the kerb, across the street from us and the next thing, all you could hear was banging and shouting and screaming,” he said.
Archbishop Martin said: “The horrific scenes on the streets of Nice once more send shock waves into our homes and hearts. How helpless we all are when someone decides to deliberately and indiscriminately target human life.
“Please keep the people of France in your prayers and especially the dead and injured, the families and loved ones of all those caught up in this senseless and brutal act.
“Our thoughts and prayers are with also with the first responders and with members of the French community living here in Ireland.
“I invite everyone to undertake an act of kindness or compassion this weekend, perhaps in some small way to counterbalance with love this awful crime.
“Lord, make us all channels of your peace; Where there is hatred, may we bring your love. Amen.”
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