At least 84 people have been killed - several of them children - after a lorry driver ploughed into crowds celebrating France's national Bastille Day in Nice.
French President Francois Hollande has described the attack as a "terrorist crime".
Northern Ireland tourists in the popular holiday destination in the south of France have described the chaos and confusion as the attack unfolded.
Another Northern Ireland tourist caught up in the Nice lorry attack, has described running from the promenade along with her young children.
Ballyclare woman Zoe Tisdale said it was a scene of utter panic.
Belfast's Lord Mayor and deputy Lord Mayor have opened a book of condolence for those killed in last week's lorry attack in Nice, France.
The Irish Department of Foreign Affairs is "urgently following up" on concerns for the safety of Irish citizens in Nice.
UTV journalist and producer Ben Terry, who was in Nice at the time of the attacks, has described a scene of “mass panic”.