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Islamic State terrorist Larossi Abballa streamed a harrowing live Facebook video of the moment he murdered a French cop and his wife in front of their three-year-old son.

Evil Larossi Abballa murdered Jean-Baptiste Salvaing and his wife in cold blood in front of their son – and then posted images of his crimes on the Internet, said French security expert David Thomson.

The film and photos appeared on Facebook, along with Abballa’s justifications for what he had done.

Abballa’s Facebook profile – under the name ‘Mohamed Ali’ – included a 13 minute video of the murders, and 15 photos, before it was suspended early this morning.

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(Image: MATTHIEU ALEXANDRE/AFP/Getty Images)

Mr Thomson, of Paris radio station RFI, said one particularly chilling post referred to the three-year-old survivor.

At one point, the child was behind Abballa on the sofa, and the terrorist wrote: "I still don’t know what I’m going to do with him."

(Image: MATTHIEU ALEXANDRE/AFP/Getty Images)

Abballa was born in the Paris commuter town of Mantes-la-Jolie, close to the murder scene.

He was a convicted Islamic extremist who was sentenced to three years in 2013 for "association with criminals preparing terrorist acts".

However despite his conviction he only spent a few months in prison.

He was frequently in trouble with the law for theft and violence, and his first criminal conviction was in 2011, when he was 19.

He frequently used social media to call for the murders of police, prison officers and journalists, often by name.

He is thought to have maintained his links with a group sending jihadists to fight in Afghanistan.

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(Image: Reuters)

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The only survivor of a police raid in the early hours of this morning was the Salvaing’s three-year-old son.

The child was "extremely shocked but otherwise unharmed," according to a spokesman for the Paris Interior Ministry.

He added that the murder was "an abject terrorist act".

French President Francois Hollande is holding a crisis meeting this morning, to try and work out how yet another known terrorist was allowed to strike again.

(Image: Wikipedia)

Many of those responsible for the Isis and al-Qaeda attacks on Paris last year, in which up to 150 people died, were also on the files of the French and Belgium security forces.

Isis meanwhile used their propaganda arm to claim responsibility for the murder of Mr Salvaing.

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A statement issued in Arabic by the Amaq News Agency, which is linked to the Islamic State, said: "Islamic State fighter kills deputy chief of the police station in the town of Mureaux and his wife with blade weapons."

(Image: MATTHIEU ALEXANDRE/AFP/Getty Images)

It comes while France is on the highest state of security alert during the Euro 2016 football championships, and just days after a gunman claiming allegiance to Islamic State killed 49 in Orlando, in the USA.

The bloodbath in France started soon after 9pm when Abballa launched the onslaught.

(Image: Reuters)

Mr Salvaing, a captain with the judicial police at nearby Mureaux, died at the scene before Abballa threatened his wife, who worked as a police secretary.

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An elite unit from the Raid and BRI police commando units arrived when the alarm was raised by near neighbours.

Negotiations started, and a police source claimed that Abballa began to "swear his allegiance to Islamic State".

He is also said to have posted threats towards Mr Salvaing’s wife on social media, prompting the officers to launch the raid.

(Image: MATTHIEU ALEXANDRE/AFP/Getty Images)

Shortly after midnight, two loud explosions were heard, and officers with machine guns were seen storming the property.

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The police source claimed that the words “Allahu Akhbar” – Arabic for "God is the Greatest" – were heard, before Abballa was shot dead.

It is not yet known whether Mr Salvaing’s wife was killed by the murderer, or by the police during the raid.