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.
Northern Ireland’s footballers have been sending messages of support to the people of Nice in the wake of the deadly Bastille Day attack.
The national team and thousands of supporters had been over in the southern French city just weeks ago to take part in Euro 2016.
As news of the tragedy broke, NI captain Steven Davis took to Twitter to show solidarity with those affected.
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”.