The French government is considering banning the foreign financing of mosques as it reshapes its counter-extremism strategy following a fresh wave of terror attacks.

Manuel Valls, the Prime Minister, told Le Monde the prohibition would be for an indefinite period but gave no further detail on the policy.

“There needs to be a thorough review to form a new relationship with French Islam,” he added.

France boosts regional security after ISIL-claimed church attack

“We live in a changed era and we must change our behaviour. This is a revolution in our security culture…the fight against radicalisation will be the task of a generation.”

Following the murder of a priest by teenage Isis supporters at a church in Normandy and the Nice attack, Mr Valls said France was “at war” and predicted further atrocities.

“This war, which does not only concern France, will be long and we will see more attacks,” he added.

“But we will win, because France has a strategy to win this war. First we must crush the external enemy.”

The French government has come under increasing criticism for failing to prevent atrocities, including the latest attack in Normandy.

Security services were tipped off that Abdel Malik Petitjean, 19, was planning an attack but police were reportedly unable to identify him from photos and a video showing him declaring allegiance to the so-called Islamic State.

He was already on country’s “fiche S” terror watchlist for attempting to travel to Syria in June but slipped through the net to re-enter France after being stopped by Turkish authorities.

Normandy church attack in pictures Show all 16 1 /16 Normandy church attack in pictures Normandy church attack in pictures The victim was the 84-year-old priest at the church, Jacques Hamel. AFP/Getty Normandy church attack in pictures French police at the scene of the attack on a church in Saint-Etienne-du-Rouvray, northern France, on July 26 AFP/Getty Images Normandy church attack in pictures More police at the scene BFM TV Normandy church attack in pictures French President Francois Hollande shaking hands with security personnel at the scene AP Normandy church attack in pictures French soldiers standing guard outside the scene of the attack AP Normandy church attack in pictures A policeman secures a position in front of the city hall after two assailants had taken five people hostage in the church at Saint-Etienne-du -Rouvray near Rouen in Normandy Pascal Rossignol/Reuters Normandy church attack in pictures A policeman holds a HKG36 assault rifle as he secures the position in front of the local town hall following the attack REUTERS Normandy church attack in pictures French judicial inverstigating police apprehends a man during a raid after a hostage-taking in the church in Saint-Etienne-du-Rouvray near Rouen in Normandy, France REUTERS Normandy church attack in pictures A French policeman arrests a man following a search in a house on July 26, 2016 in the Normandy city of Saint-Etienne-du-Rouvray, where a priest was killed earlier today in the latest of a string of attacks against Western targets claimed by or blamed on the Islamic State jihadist group. French President Francois Hollande said that two men who attacked a church and slit the throat of a priest had "claimed to be from Daesh", using the Arabic name for the Islamic State group. Police said they killed two hostage-takers in the attack in the Normandy town of Saint-Etienne-du-Rouvray, 125 kilometres (77 miles) north of Paris. / AFP PHOTO / CHARLY TRIBALLEAUCHARLY TRIBALLEAU/AFP/Getty Images AFP/Getty Images Normandy church attack in pictures An undated photo shows French priest, Father Jacques Hamel of the parish of Saint-Etienne. Hamel was killed, and another person was seriously wounded after two assailants took five people hostage in the church at Saint-Etienne-du-Rouvray near Rouen in Normandy, France, July 26, 2016 in an attack on a church that was carried out by assailants linked to Islamic State. Photo Courtesy of Parish of Saint-Etienne via Reuters NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED BY REUTERS AS A SERVICE TO CLIENTS. REUTERS Normandy church attack in pictures The bell tower of the church is seen after a hostage-taking in Saint-Etienne-du-Rouvray near Rouen in Normandy, France, July 26, 2016. A priest was killed with a knife and another hostage seriously wounded in an attack on a church that was carried out by assailants linked to Islamic State. REUTERS/Pascal Rossignol REUTERS Normandy church attack in pictures French policemen stand outside a house during a search in a house on July 26, 2016 in the Normandy village of Saint-Etienne du Rouvray after a priest was killed in the latest of a string of attacks against Western targets claimed by or blamed on the Islamic State jihadist group. French President said that two men who attacked a church and slit the throat of a priest had "claimed to be from Daesh", using the Arabic name for the Islamic State group. Police said they killed two hostage-takers in the attack in the Normandy town of Saint-Etienne-du-Rouvray, 125 kilometres (77 miles) north of Paris. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images AFP/Getty Images Normandy church attack in pictures Police officers stand in front of a building during a search operation in Saint-Etienne-du-Rouvray, Normandy, France, following an attack on a church that left a priest dead, Tuesday, July 26, 2016. Two attackers invaded a church Tuesday during morning Mass near the Normandy city of Rouen, killing an 84-year-old priest by slitting his throat and taking hostages before being shot and killed by police, French officials said. (AP Photo/Francois Mori) AP Normandy church attack in pictures Police officers conduct a search in Saint-Etienne-du-Rouvray, Normandy, France, following an attack on a church that left a priest dead, Tuesday, July 26, 2016. Two attackers invaded a church Tuesday during morning Mass near the Normandy city of Rouen, killing an 84-year-old priest by slitting his throat and taking hostages before being shot and killed by police, French officials said. (AP Photo/Francois Mori) AP Normandy church attack in pictures French Interior Minister Bernard Cazeneuve visits the church REUTERS Normandy church attack in pictures A French policeman stands near an armoured vehicle of the French Research and Intervention Brigade (BRI) police during a search in a house on July 26, 2016 in the Normandy village of Saint-Etienne du Rouvray after a priest was killed in the latest of a string of attacks against Western targets claimed by or blamed on the Islamic State jihadist group. French President said that two men who attacked a church and slit the throat of a priest had "claimed to be from Daesh", using the Arabic name for the Islamic State group. Police said they killed two hostage-takers in the attack in the Normandy town of Saint-Etienne-du-Rouvray, 125 kilometres (77 miles) north of Paris. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images AFP/Getty Images

Petitjean and 19-year-old Adel Kermiche took six people hostage at a church in Saint-Étienne-du-Rouvray and slit the throat of its priest, Father Jacques Hamel, before being shot dead by police.

Kermiche was also known to security services and was wearing an electronic surveillance tag while on bail as he awaited trial for membership of a terror organisation at the time.

It came less than a fortnight after the Nice attack, when a Tunisian man killed 84 people and injured 300 more when he ploughed a lorry into crowds celebrating Bastille Day.

Mohamed Lahouaiej-Bouhlel was not among the 10,000 names on the “fiche S” but the inclusion of terrorists including several of the Paris attackers, the two Charlie Hebdo gunmen and their accomplice Amedy Coulibaly, as well as a lorry driver who beheaded his manager and attempted to blow up a chemical plant has shown the system to be ineffective.

Intelligence officials have admitted that they are under-resourced to deal with the potential threat from each individual, who would need up to 20 people monitoring them every day.

France’s continuing state of emergency has drastically expanded detention powers, sparking a wave of controversial house arrests since November.