Grief, mourning in France after deadly Bastille Day truck attack

As new details emerge about the Tunisian man who drove a truck through crowds celebrating Bastille Day in Nice, killing 84 people and wounding 202 others, French leaders extended a state of emergency imposed after the Nov. 13 Paris attacks and vowed to deploy thousands of police reservists on the streets.

Meanwhile, people in France and around the world are mourning the loss of life in what French officials have called an "undeniable act of terror."

Mass held to pay tribute to victims.

People attended mass on Friday to honour the victims of Thursday's attack. Below, a woman is seen praying at the Cathedral Sainte Reparate in Nice.

Tour de France observes moment of silence.

The leaders of the Tour de France cycling race took time to pay their respects to the victims of the attack in Nice, placing flowers on the podium after a moment of silence.

Police presence at the start of the 13th stage of the race was heightened following the carnage in Nice.

Driver ID'd as investigation continues.

Police identified the attacker asMohamedBouhlel, a 31-year-old Nice resident, and said he had drawn a gun on them.

Bouhlelwas known to police for petty crimes but was not on a watch list of suspected militants. He was shot dead by officers at the scene, leaving the truck's windshield riddledwith bullets.

The investigation "will try to determine whether he benefited from accomplices," Paris prosecutor Francois Molins said. "It will also try to find out whether Mohamed Laouaiej Bouhlel had ties to Islamist terrorist organizations."

Hollande calls attack a 'monstrosity.'

French President Franois Hollande has declared three days of mourning and extended the state of emergency that has been in place since the country's last attacks on Nov. 13, 2015, which killed 130 people around Paris.

"Why Nice? Because it's a town famous across the world, a beautiful town, one of the most beautiful on the planet,"Hollandesaid."Why the14thof July? Because it's the celebration of Bastille Day freedom."

The world mourns with France.

U.S. Secretary of State John Kerry, right, and Russian Foreign Minister Sergey Lavrov, second left, laid flowers at the French Embassy in Moscow to pay condolences to victims of Thursday's attack.

Italian tribute to victims.

A life-size copy of Michelangelo's David was displayed on its back as a tribute to the victims of the Nice attack, during a ceremony in Florence, Italy, on Friday.

Memorial set up in Montreal.

Henri Desbiolles, who is originally from the Haut Savoie region of France, is overcome with emotion as he visits a memorial in front of the French Consulate in Montreal.