>> reporter: he spoke to a grooe grieving nation. he expressed sorrow for the victims and their families and everyone affected in nice. he promised a swift response to finding all the culprits. he resolved to tackle terrorism from abroad and home grown. he said france is in tears, but she will be stronger than the fanatics who wish to hurt her. he confirmed among more than 84 dead, there are children, and he's extended that state of emergency for another three months. >> it was a family event. there were a lot of young kids. come out of that scene. do they have a sense at all, who might be behind this right now? >> well, there's been no claim of responsibility, but, of course, they'll be looking at previous attacks that took place in france over these last 18 months, and they will be looking specifically at isis and seeing if there are any patterns there, any messages, any chatter among isis groups on the internet, on various social media outlets. they'll be combing through all the information they find on the scene and seeing in the