Bastille Day mass killer Mohamed Lahouaiej Bouhlel was ‘not at all religious’ but a violent misfit obsessed by terrorism, Paris’s most senior prosecutor said today.

Francois Molins, who is leading the investigation into the atrocity, portrayed the murderer as a disturbed loner who planned his crimes with chilling precision.

Bouhlel, 31, carried out a ‘premeditated crime’ that saw 84 people, including 10 children, run down and killed by a 19-tonne lorry hired for the equivalent of just over 1,330 pounds.

As details emerged about the ease with which Bouhlel struck, senior French politicians including Prime Minister Manuel Valls were roundly booed as they attended memorial services.

Bernard Cazeneuve described mass murder Mohamed Lahouaiej Bouhlel (pictured) as 'an unbalanced and very violent individual' - but said there was no link between him and any terror groups

Many in France are furious at the way a known criminal with clear psychological problems was allowed to cause such carnage last Thursday, while thousands were enjoying the Bastille Day public holiday.

ISIS has claimed Bouhlel was as one of their ‘soldiers’, but Mr Molins said there was no evidence whatsoever of him having any links with the terrorist group.

Rather than a ‘holy warrior’, he regularly broke all the laws of Islam, while attacking his estranged wife and three young children.

‘He was not at all religious,’ said Mr Molins. ‘He did not practice the Muslim religion, he ate pork, drank alcohol, and had an out-of-control sex life.’

In the days leading up to the Nice attack, Bouhlel had developed ‘an interest in the jihadi movement’ and regularly looked up terrorist atrocities online.

After being shown a decapitation video, he told a friend: ‘I’m used to it’. Photos of dead bodies, ISIS flags, and the late terror mastermined Osama Bin Laden were all found on a computer at his flat in Nice.

Passers-by gather on the famed Promenade des Anglais in Nice, southern France, three days Bouhlel drove a truck through revelers

Bouhlel also grew a beard, in the manner of jihadis, and ‘could not understand’ why ISIS, which is currently mainly based in parts of Syria and Iraq, shouldn’t be allowed its own country.

He also regularly consulted an article and photo from his local newspaper, Nice Matin, from January about an HGV that had accidently driven onto a café terrace.

Bouhlel, who was bisexual and regularly picked up lovers of both sexes, had also searched the Internet for details of the Orlando nightclub shooting in June, in which 49 people were murdered and 53 wounded.

The American outrage was the deadliest terrorist attack on US soil since 9/11 in 2001.

Boulhel carried out reconnaissance visits to the Promenade des Anglais on the two days leading up to July 14th, and took four ‘selfie’ photographs of himself on the day. .

He also looked for information about the July 14th festivities, and Googled terms such as ‘horrible accident’, ‘terrible fatal accident’ and ‘shocking video – not for sensitive souls’.

Commenting on Bouhlel’s apparent motives, Mr Molins said: ‘Radicalisation can take place rapidly when people are disturbed and fascinated by violence.’

A view of the famed Promenade des Anglais, scene of the Thursday's attack in Nice

Before the Paris press conference, where Mr Molins spoke, Interior Minister Bernard Cazeneuve had described Bouhlel as ‘an unbalanced and very violent individual’ who was on a social services watch list.

Both Mr Cazeneuve and Mr Molins said six people currently in custody in relation to the case have no links with ISIS either.

Two – a man and a woman – are an Albanian couple said to have provided a 7.65mm pistol to Bouhlel, while the rest were connected to the killer simply because their numbers appeared on his mobile phone.

It also emerged today that 13 of the dead remain unidentified, because of reasons including bodies being mutilated out of all recognition.

French soldiers patrol on the famed Promenade des Anglais in Nice

There were also revelations about how concerned neighbours had reported Bouhlel for attacking his own children, aged five, three and 18 months.

‘Social services were concerned about what he was doing to the youngsters, and wanted to keep him away from them,’ said another investigating source.

Two particularly unpleasant incidents saw Bouhlel defecate on his daughter’s bed, and also rip open another child’s favourite cuddly toy with a knife.

The source added: ‘Evidence of these attacks was provided in the form of photographs, and the suspect soon moved out of the family home.’

Bouhlel, a Tunisian national, was originally given a 10-year residency permit in France in 2009 after marrying his cousin, Hajer Khalfallah, in Nice.

She was arrested and questioned by antiterrorism judges after her former husband’s death, but has now been released without charge.

Bouhlel regularly beat up his estranged wife, and she too had applied for protection from the authorities.

It also emerged today that only 35 of the dead have been formally identified, because of reasons including bodies being mutilated out of all recognition.

A huge number of people gathered on Monday on the Promenade des Anglais to observe a minute of silence on the third day of national mourning

A French flag is seen as people gather to observe a minute's silence at the Jardin Albert 1er on the Promenade des Anglais

Solemn: People gather at a makeshift memorial during the minute of silence in Nice

Mr Cazeneuve told RTL radio today that Bouhlel's alleged links with radical Islam currently relied solely on ISIS's claims of responsibility for the Nice carnage, which they released on a website at the weekend.

'We can not ignore the fact that he was an unbalanced and very violent individual, and it seems that his psychology demonstrates these traits,' said Mr Cazeneuve.

If Bouhlel had indeed become an Islamist in the last days of his life, then it was due to 'rapid radicalisation', said Mr Cazeneuve.

A spokesman for Paris prosecutors, who are leading the investigation into the Nice slaughter, said 49 victims remained critical in Nice, with 18 of them still fighting for their lives.

The total number of injured was 249, and they included 35 children. Only 35 of the 84 dead have been formally identified, the spokesman added.

Authorities say Mohamed Lahouaiej Bouhlel, a Tunisian living in Nice, had become recently and rapidly radicalized.

Cazeneuve said 59 people are still hospitalized after the attack Thursday, 29 of them in intensive care, out of 308 people injured overall. Many of the dead and injured were children watching a fireworks display with their families.