At least 84 people are dead after a suspect identified as Mohamed Lahouaiej Bouhlel drove a truck into July 14 celebrators in Nice, France. Gunfire was also reported. The crowd was celebrating in the Promenade des Anglais. Is the Islamic State behind the attack? Right now it’s unconfirmed. However, Terrorism Research & Analysis Consortium reports that ISIS terrorist accounts are posting about it.

A tweet sent out by an ISIS-supporting Twitter account links the Nice attack as retaliation for the death of Abu Omar al-Shishani, a Georgian Chechen commander of the Islamic State that ISIS recently admitted had been killed, reports The Telegraph.

An #ISIS Twitter account is linking #NIce's Truck attack to the death of Omar Shishani pic.twitter.com/vXfGZwJajs — Mohanad Hage Ali (@MohanadHageAli) July 14, 2016

Breaking News reports that a vehicle crashed into Bastille Day crowd, sending everyone running. Videos of the chaos were quickly uploaded to Twitter. Watch those below.

Local resident Jimmy Ghazal reported that a truck loaded with gunmen crashed into a crowd. However, while the gunfire has been confirmed, NBC News reports that it was only one gunman in the truck. This does not mean he was acting alone.

Gunmen opened gun fire at people gathered to celebrate 14 Juillet at People Promenade Des Anglais, Nice, France — Jimmy Ghazal (@jimmyghazal) July 14, 2016

@Inflowlive It was a truck that drove through security with possible gunmen on board. A lot of shots were fired — Jimmy Ghazal (@jimmyghazal) July 14, 2016

Bastille Day is celebrated every year on July 14 in France and other French-speaking countries around the world. It celebrates the beginning of the French Revolution, which occurred over 200 years ago.