Nice attack: Terror strikes France again. Here's what you need to know

At least 84 people were killed and many others injured in Nice, France when a suspected terrorist drove a lorry loaded with weapons and hand grenades into a crowd watching Bastille Day celebrations.

Here's what we know:

1. The driver was shot dead by the police after rampaging on for nearly one kilometre. He was a 31-year-old French citizen born in Tunisia and is said to be known to the police.

2. Head of the local region, Christian Estrosi, said guns and "larger weapons" were found in the truck.

3. French President François Hollande announced that France's state of emergency - due to end July 26 - would be extended by an additional three months.

4. He condemned the attack as a "monstrosity," and said there could be no doubt that it was an act of terror.

5. "France as a whole is under the threat of Islamic terrorism," he said. "We have to demonstrate absolute vigilance and show determination that is unfailing. Nothing will lead us to give in to our will to fight against terrorism," the French leader concluded.

6. French Interior Minister Bernard Cazeneuve said, "The identification of the criminal is in progress." He refused to confirm reports that an ID card was found after police shot the truck driver dead.

The world responds:

Appalled by the horrific attack in Nice. I strongly condemn such mindless acts of violence. My thoughts are with the families of deceased.

— Narendra Modi (@narendramodi) July 15, 2016

Mexican senate building light up in show of unity with Nicehttps://t.co/3UsckO6QN2 pic.twitter.com/15PbKkPTv0

— BBC News (World) (@BBCWorld) July 15, 2016

A week & a block away from the scene of a deadly ambush, Dallas shows support to Nice, France #StandWithDallas pic.twitter.com/xmcG584WZn

— Jeff Paul (@Jeff_Journalist) July 15, 2016

Canadians are shocked by tonight's attack in Nice. Our sympathy is with the victims, and our solidarity with the French people.

— Justin Trudeau (@JustinTrudeau) July 14, 2016

The world is turning so cruel...How do human beings do this to each other.My heart bleeds for the victims of the Nice attack #PeaceForNice

— PRIYANKA (@priyankachopra) July 15, 2016

The truck has no religion. #NiceAttack #Nice

— Abhijit Majumder (@abhijitmajumder) July 15, 2016

Praying for France as we mourn horrific attack in Nice. "He heals the brokenhearted and binds up their wounds." Psalm 147:3 #PrayForNice

— Ravi Zacharias (@RaviZacharias) July 15, 2016

Our thoughts and prayers go out to all those affected by the tragedy in Nice. #PrayForNice pic.twitter.com/JBrb6pPLiq

— Welcome to Yorkshire (@Welcome2Yorks) July 15, 2016

Not a very 'Nice' Morning. RIP God!

— Sonu Nigam (@sonunigam) July 15, 2016

Shocking & horrific attack in France. My thoughts are with the victims & their families. Solidarity with emergency services & people of Nice

— Jeremy Corbyn MP (@jeremycorbyn) July 15, 2016

So sad to hear about the news in Nice. NO to terrorism all around the world. #PrayForNice pic.twitter.com/hJydHZJKaS

— Marc Márquez (@marcmarquez93) July 15, 2016