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An 'Islamic State' killer has stabbed a top cop and his wife to death in their Paris home.

Jean-Baptiste Salvaing, 42, a police commander, suffered nine stomach wounds in the 'terror attack' at his suburban house in the Yvelines department, north of Paris, shortly after 8.30pm.

His wife's body was found in the property after elite RAID commandos stormed the building and killed the attacker.

The only survivor was the couple’s three-year-old son.

Islamic State's terror group's Amaq news agency said the attacker was an "Islamic State fighter".



There were also unconfirmed claims that the attacker had discussed his "affiliation to ISIS"during negotiations with the police.

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A source close to the case said: "It’s said that he shouted Allahu Akhbar (Arabic for God is the Greatest) during the attack, and spoke about his membership of ISIS.



Neighbours also said the man had served with the French Army, in the Foreign Legion



Bernard Cazeneuve, France’s Interior Minister, said "every line of enquiry" including terrorism was being investigated".

Mr Cazeneuve said the "immediate priority" was the wellbeing of the couple’s orphaned son.

Mr Salvaing was an assistant chief with the judicial police at nearby Mureaux, while the dead killer was also from Magnanville.

"It is believed the attacker is a neighbour," said a witness at the scene of the siege.

(Image: Wikipedia)

"The street has now been shut off, and the electricity and gas has been cut."

An Interior Ministry spokesman in Paris said a police negotiator started talking to the neighbour, before he began tweeting threatening messages.

It is then that the order was given for the commandos to move in.

(Image: MATTHIEU ALEXANDRE/AFP/Getty Images)

Mr Salvaing was known as a ‘"friendly police officer with a very good reputation," said a former colleague.

France is currently under a State of Emergency following last year’s Islamic State terrorist attacks, in which almost 150 people were murdered, including two police officers.

In November 2015 it was RAID who took part in operations at the Bataclan theatre in Paris, where 90 people were killed during a series of bombings, shootings and hostage taking by ISIS extremists.

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Officers from the unit also launched a follow-up operation in Saint-Denis where Abdelhamid Abaaoud, the 'mastermind' of the attacks, was killed in a firefight.