Bastille Day horror: Isis claim responsibility as three arrested over Nice terror attack

The Islamic State group claimed responsibility Saturday for an attack in which a Tunisian drove a truck through a crowd in Nice, killing 84, prompting hard questions in France over security failures.

In a statement via its Amaq news service Isis said one of its "soldiers" carried out the attack on Friday "in response to calls to target nations of coalition states that are fighting (Isis)".

Tunisian Mohamed Lahouaiej-Bouhlel, 31, smashed a 19-tonne truck into crowd of people in the Riviera city who were celebrating Bastille Day -- France's national day. Police said he had no known connection to jihadist groups.

French President Francois Hollande met with his defence and security chiefs and cabinet ministers as criticism from the opposition and media mounted over security failings after the third major attack in France in 18 months.

"If we are at war, as the government tells us, then the currency of war is intelligence, learning from experience, analysing failures and victories," wrote Yann Marec in an editorial for the southern region's Midi Libre newspaper.

He was one of several calling for action, and not merely "the same old solemn declarations" from the government, as Le Figaro daily said.

Some 30,000 people had thronged the palm tree-lined Promenade des Anglais on Thursday night to watch a fireworks display with their friends and families, but the night turned to horror as the truck left mangled bodies strewn in its wake.

"Flaws and shortcomings"

Hollande said the country would observe three days of mourning as he warned the death toll could rise further, with more than 50 people still fighting for their lives.

Four more people linked to Lahouaiej-Bouhlel have been arrested. The driver's estranged wife is also being held by police.

Isis also claimed responsibility for November 13 attacks in which 130 people were killed in Paris, while gunmen in January 2015 attacks on the Charlie Hebdo weekly and a Jewish supermarket were linked to both IS and Al-Qaeda.

The massacre has once again shaken the country to its core, and prompted questions about the effectiveness of security measures with the country already under an eight month-long state of emergency.

Police investigate the scene after a truck plowed through Bastille Day revellers in Nice. Photo / AP
Police investigate the scene after a truck plowed through Bastille Day revellers in Nice. Photo / AP

France, which has a Muslim population of nearly five million, is also the origin of hundreds of jihadists who have flocked to fight alongside IS.

Presidential contender and former prime minister Alain Juppe said Friday that the latest carnage could have been prevented if "all measures" had been taken.

But government spokesman Stephane Le Foll slammed Juppe's comments, saying there was as much security present for the fireworks display as there had been for the Euro 2016 football tournament in the city.

He said there were more than 185 police, gendarmes and soldiers on the ground, as well as municipal police and a vast network of surveillance cameras.

"Despite all of that, this man's decisions... created the drama and horror we experienced."

A French parliamentary inquiry last week criticised numerous failings by the intelligence services over the Paris attacks.

"We know of course that there are still flaws and shortcomings," said Hollande.

"Government intervention is imperative in that area in order to better coordinate our intelligence services," he added.

People comfort each other as they gather at a makeshift memorial to honor the victims of the Nice terror attack. Photo / AP
People comfort each other as they gather at a makeshift memorial to honor the victims of the Nice terror attack. Photo / AP

A depressed loner

Authorities will also face questions over how Lahouaiej-Bouhlel slipped through the cracks, as initial investigations showed he had a record of petty crime and domestic violence, but no known connection to terrorist groups.

Anti-terrorism prosecutor Francois Molins said the attack was "exactly in line with" calls from jihadist groups for supporters to kill in their home countries.

For several years, extremist groups such as IS and Al-Qaeda have exhorted followers to strike "infidels" -- singling out France on several occasions -- using whatever means they have to hand.

In September 2014, IS spokesman Abu Mohammed al-Adnani, suggested supporters "run (infidels) over with your car".

While some attacks on the West -- such as the November assault on Paris and the March bombings in Brussels -- were carried out by jihadists who have been to the centre of IS operations in Iraq and Syria, others have been led by so-called "lone-wolf" attackers.

Inspired from afar by Islamist propaganda, such attackers are a massive headache for intelligence services.

As authorities in France frantically search for clues that might indicate a network of supporters of the kind that emerged after the Paris attacks last November, what is known so far about Mohamed Lahouaiej Bouhlel suggests a troubled, angry loner with little interest in Islam.

Mohamed Lahouaiej-Bouhlel. Photo / Supplied
Mohamed Lahouaiej-Bouhlel. Photo / Supplied

The father-of-three was born in Msaken, a town in Tunisia, but moved to France years ago and was living in the country legally, working as a delivery driver.

Lahouaiej-Bouhlel's father said he had suffered from depression and had "no links" to religion.

"From 2002 to 2004, he had problems that caused a nervous breakdown. He would become angry and he shouted... he would break anything he saw in front of him," Mohamed Mondher Lahouaiej-Bouhlel said in Tunisia.

"Each time he had a crisis, we took him to the doctor who gave him medication."

His son hadn't visited Tunisia in four years and hadn't stayed in contact with his family, he said.

"What I know is that he didn't pray, he didn't go to the mosque, he had no ties to religion," said the father, noting that Bouhlel didn't respect the Islamic fasting rituals during the month of Ramadan.

Neighbours described the attacker as a loner who never responded to their greetings.

He and his wife had three children, but she had demanded a divorce after a "violent argument", one neighbour said.

Bouhlel had had a series of run-ins with the law for threatening behavior, violence and theft over the past six years.

In March, he was given a six-month suspended sentence by a Nice court for a road-rage incident.

A baby carriage is left on the beach a day after a truck mowed through revellers. Photo / AP
A baby carriage is left on the beach a day after a truck mowed through revellers. Photo / AP

His court-appointed lawyer, Corentin Delobel, said he observed "no radicalisation whatsoever," and Paris prosecutor Francois Molins said Bouhlel was never placed on a watch list for radicals.

Still, Bouhlel could have felt inspired by calls from extremist groups to carry out acts of murder in France, said Molins.

In Nice, the seaside streets that would normally be bustling on a summer weekend were near-deserted, with teary residents making their way to the promenade to lay down flowers in memory of the dead.

At least 10 children and teenagers were among the dead as well as tourists from the United States, Russia, Ukraine, Switzerland and Germany.

- AFP with additional reporting from AP

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