Another terror attack has hit France as a terrorist used a rented truck to kill at least 84 people, including 10 children in a rampage during Bastille Day celebrations in the city of Nice. Also in January past year, a mass shooting at the satirical magazine Charlie Hebdo office in Paris, carried out by two Islamist gunmen, killed 17 people, followed by another terror attack next day in a Jewish grocery store, where four people were shot dead.
The truck's driver was killed by police after an exchange of gunfire.
He went on to say, "We stand in solidarity and partnership with France, our oldest ally, as they respond to and recover from this attack".
The attack took place as people in the French resort town were gathering near Nice's Palais de la Mediterranee, a building facing the beach, to watch fireworks.
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In addition, a state of emergency in the country has been extended by three months and Prime Minister Manuel Valls has declared three days of national mourning from Saturday.
There was no immediate claim of responsibility. The warning was part of Calvar's testimony in front of a parliamentary commission tasked with examining how French security services fight terrorism, after a government investigation concluded that intelligence failures, both in France and overseas, had contributed to the failure of avoiding the November attacks in Paris.
It is also believed that three members of France's national police chased the lorry on foot.
The holiday, called "La fête nationale" in France, is celebrated annually on July 14 to commemorate the storming of the Bastille prison on July 14, 1790, during the French Revolution.
Mr Greene said of the truck driver's progress: "He came behind us and beside us as he was cutting through people".
"Fifty children were treated for their injuries", he said. French President Francois Hollande said "the terrorist character" of the truck attack can not be denied. "While the full picture is still emerging, it seems that at least 80 people are feared dead and many others have been injured".