Scenes from the terror attack in Nice

French people were celebrating Bastille Day, remembering an important moment in the 1789 French Revolution.

Revelers were watching fireworks on the Promenade des Anglais in the French Riviera city of Nice when a truck ploughed through the crowds, killing at least 84, including children, and critically injuring around 18 others.

Police shot and killed the driver, who was a French national of Tunisian descent, according to NBC sources.

Authorities are still examining the bullet-riddled truck which reportedly had grenades and weapons inside.

Emergency services arrived on the scene to attend to the injured.

Police officers liaised with the army in the aftermath of the attack.

Police officers began to carry out spot checks on cars entering Nice after the attack.

People mourned those injured and dead.

Police officers, firefighters and rescue workers are seen at the site of an attack on the Promenade des Anglais.

French President Francois Hollande extended the state of emergency by three months. It had originally been set to expire on July 26.

The state of emergency allows French authorities greater powers to deal with terrorist threats.

French Interior Minister Bernard Cazeneuve tells reporters in the early hours of Friday, that the death toll in the previous night's attack in Nice stood at 80, with scores injured including 18 in 'critical condition'. The death toll has since hit 84.

The Mexican Senate building is illuminated with the colors of the French national flag on Thursday in Mexico City in solidarity following the deadly attack in Nice.

The flags fly at half-mast at the French embassy in London as a sign of respect for the Nice attack victims.

An increased number of police officers were stationed outside the embassy on Friday morning.

French President Francois Hollande heads up the country's security and defense council to decide on the next steps to take after the Nice attack.