Deadly truck attack in Nice unfolded at high speed

French investigating police conduct a search for clues around a truck, the day after a heavy a truck ran into a crowd at high speed killing scores and injuring more who were celebrating the Bastille Day national holiday.

2200: A fireworks display attended by some 30,000 locals and tourists, including many children, begins near a tourist office on the Promenade des Anglais, a wide boulevard lined with palm trees and vast walking areas on the water's edge that was closed to traffic for the occasion.

Hollande also said he would activate those who had once served in the military and the gendarmerie to help relieve police and active-duty soldiers.

In addition, the method of attack was atypical to what security officials might have been expecting - a box truck rather than explosives or firearms.

No group has claimed responsibility for the carnage, but French officials called it an undeniable act of terror. A US government source told CBS News that USA intelligence does not know definitively whether Bouhlel was directly affiliated with a terrorist organization. Attacking soft targets has been the hallmark of modern terrorism, yet according to Hoffman, the attack in Nice could be a crucial step forward for the organizations that are trying to damage the fabric of liberal Western societies. Another man injured 10 days later when he deliberately drove a van into shoppers at a Christmas market. Both suspects, who survived, have histories of mental illness. This is also a signal for us to unite more resolutely in our fight against the worldwide terrorism. The blast came near the end of the Islamic holy month of Ramadan when streets were teaming with people - much like Thursday's festivities that drew crowds across France. In Nov. 2015, 130 people died when terrorists opened fire and detonated suicide bombs at six busy locations across Paris.

The driver of the truck fired a shot at the people and then plowed through the crowd on the main street for more than a mile. Several other planned attacks have been foiled. Some bus and trolley stations have since been fortified with concrete barriers to prevent cars from driving into crowds.

So-called vehicle impact attacks have also been carried out elsewhere. "Our cities are united".

The choice of Nice, one of France's wealthiest and most Right-wing cities, the symbol of sex and sun on the French Riviera should come as no surprise.

"We can't put a police officer behind every person", Goulet said.

"We are determined to fight against terrorism and we will be stronger than terrorists", she added. "This is a vicious cycle that is not ending". Hollande announced a three-month extension to the state of emergency imposed after the November 13 attacks and the government declared three days of national mourning to begin Saturday. The measure allows for any gathering - such as the Bastille Day festivities - to be banned.

He said everyone ran, many into a restaurant.

The State Department said two American citizens were among the dead. Last month, a 29-year-old security guard killed 49 people and wounded 53 others at a gay nightclub in Orlando. He said he was inspired by the Islamic State group and other rival militant groups, although his motivation remains unclear.

Local media, citing law enforcement sources, say an ID found in the truck belonged to Mohamed Lahouaiej-Bouhlel, and that police believe that is the identity of the driver.

"I wanted to see the paradise", he said.

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