Two Isis supporters armed with knives have been shot dead after murdering a priest at a Catholic church in Normandy.

The French interior ministry said the attackers took hostages including nuns and members of the congregation after storming in during morning mass. One hostage was in a life-threatening condition, another was lightly wounded and three others were freed unharmed.

Local reports said the elderly priest, Father Jacques Hamel, had served the church for decades and had his throat slit.

France knife attack - what we know so far

The attackers were “neutralised” by security forces, a spokesperson for France's Police Nationale said, adding that security assessments continued.

The two attackers stormed the church in Saint-Etienne-du-Rouvray during a service at around 10am local time (9am BST) on Tuesday, taking the priest, two nuns and several members of the congregation hostage.

The crisis continued for around an hour before the armed men were shot dead by police when they emerged in a courtyard outside the church.

Speaking at the scene of the attack, interior ministry spokesman Pierre-Henry Brandet said the church was being searched for bombs and booby traps as forensic investigations continued.

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

President Francois Hollande and Bernard Cazeneuve, the French interior minister, met the three uninjured hostages and families of the victims after visiting the town.

Mr Hollande said the two attackers pledged allegiance to Isis, while the terrorist group praised them as “soldiers of the Islamic State” in a statement via its propaganda agency.

The Paris prosecutor said the incident was being investigated by the national counter-terrorism task force (SDAT) and the General Directorate for Internal Security (DGSI) intelligence agency.

One person has so far been detained in connection with the investigation.

Manuel Valls, France's Prime Minister, wrote on Twitter: "Horror in the face of the barbaric attack on a church in Seine-Maritime. All of France and all Catholics are wounded. We stand together."

(AP)

The Vatican said Pope Francis shares the “sorrow and horror” felt over the incident, adding: “We are particularly struck because this horrible violence has occurred in a church - a sacred place where we pronounce God's love - with the barbaric murder of a priest and worshippers affected.”

The Archbishop of Canterbury, Justin Welby, wrote on Twitter: “Evil attacks the weakest, denies truth and love, is defeated through Jesus Christ. Pray for France, for victims, for their communities.”

The incident came under a fortnight after the Nice attack, when 84 people were killed and more than 300 injured by an Isis supporter who drove a lorry into crowds celebrating Bastille Day.