The bereaved father of a Paris man killed by authorities following a Saturday Orly airport attack on a French soldier maintained Sunday his son was "not a terrorist" and instead under the influence of drugs and alcohol, according to reports.

It was this second vehicle, which security officials found in the parking lot, that allowed authorities to link the shooting in Garges-lès-Gonesse to the Orly airport attack hours later, said Molins.

Ben Belgacem, a Frenchman born to Tunisian parents, was known to police and intelligence agencies.

In 2001, he was sentenced to five years in prison for armed robbery and in 2009, he was back in jail for drug trafficking.

He later went into a nearby cafe and threatened to take customers hostage "in the name of Allah" and fired his gun around 12 times, Molins said.

"He never prayed. He drank and under the effect of alcohol and cannabis looks what happens".

Last month, calm in French capital had been broken once again after an Egyptian, 29, attacked a group of soldiers near Louvre Museum before being shot and seriously wounded.

Molins said at a news conference on Saturday that Belgacem phoned his father and brother on Saturday morning before the attack, and afterwards he opened fire at a police traffic patrol, injuring one officer.

The father of the Orly Airport attacker said his son called him before the assault to beg for forgiveness.

His home was one of scores searched in 2015 in the aftermath of the suicide bomb and gun attacks which killed 130 people in Paris, the Paris prosecutors' office said.

In an interview with French radio Europe 1 on Sunday, a man identified as the suspect's father said Belgacem wasn't a practicing Muslim and drank alcohol. He was shot dead by soldiers after saying he wants to "die for Allah" whilst pointing a gun at a soldier's head at Orly airport. An estimated 3,000 passengers were evacuated.

French President Francois Hollande said investigators will determine whether Saturday's attacker "had a terrorist plot behind him". No one was injured.

The military patrol at Orly was part of the Sentinelle force installed around France to protect sensitive sites after a string of deadly Islamic extremist attacks.

The attack at Orly comes with France still on high alert following a wave of jihadist attacks that have claimed more than 230 lives in two years.

Belgacem had been flagged as having been radicalized during a spell in detention in 2011-2012, Molins said.

Orly is Paris' second-biggest airport behind Charles de Gaulle, serving domestic and worldwide flights, notably to destinations in Europe and Africa.

The national security operation was launched following the Paris terror attacks in January 2015; France has been under a state of emergency since November that year.