France on Wednesday blamed a communications breakdown for a series of blunders that saw three suspected extremists walk out of a French airport after being transferred from Turkish custody.

Authorities were left red-faced after an announcement they had arrested the three men at a Paris airport turned out to be false.

To make matters worse, it emerged the suspected French extremists had been put on a different plane entirely to the southern city of Marseille where they were - to their apparent surprise - able to walk freely from the airport on Tuesday.

In another snag, passport control failed to flag the men as suspicious, as a security databank was out of order at the time, police sources added.

The government was however spared further blushes from the fiasco as the men handed themselves over to police on Wednesday nearly a day later.

"There was clearly a massive bungle but it was in large part due to ... the absence of proper collaboration with Turkish authorities," Defense Minister Jean-Yves Le Drian told France Info radio.

The trio included the 29-year-old brother-in-law of Toulouse extremist Mohamed Merah, who was shot dead by police after he murdered seven people, including three children, in a 2012 killing spree.

A 27-year-old previously convicted over terrorism-related charges and links to an extremist group, was also one of the three arrested in Turkey.

The interior ministry claimed that after the pilot of the Paris-bound flight refused to allow them on board the Turkish authorities put them on the flight to Marseille.
But it insisted that Paris did not become aware of the last-minute change of plan until after the men had landed on French soil.

One of the trio's lawyers, Pierre Dunac, said the men were not questioned when they landed. "As incredible as it might seem, it's true."

The debacle came as France was juggling several extremist threats: Hundreds of citizens leaving to fight in Iraq and Syria, a national taken hostage and threatened with execution in Algeria and ISIL calling for Muslims to kill French citizens.

"France is not afraid," Interior Minister Bernard Cazeneuve insisted this week, vowing the country was fully prepared to deal with any threat on home soil.

One of the three, Imad Jebali, "told us by phone that the pressure was too great," said Pierre Le Bonjour, another lawyer for the suspects.
"Clearly from the start... our clients showed a willingness to explain themselves to police and justice officials," he said.
"We could only agree that it was the right thing to do."

According to Cazeneuve, around 930 French citizens or residents, including at least 60 women, are either actively engaged in Iraq and Syria or are planning to go.

Source: Agencies