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The Berlin Christmas market massacre suspect pledged allegiance to the Islamic State terror group, a chilling video released by the terror group has shown.

The clip was released just hours after Anis Amri was shot and killed by police during a routine stop in Italy.

ISIS said in a statement via its Amaq news agency: "The Berlin attacker carried out a new attack against an Italian police patrol in Milan and was killed in an exchange of fire."

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In the video posted online, Amri pledges his allegiance to ISIS leader Abu Bakr al-Baghdadi and called for supporters to take revenge on "crusaders" bombing Muslims.

He says: "My message to crusaders bombing Muslims everyday... Their blood will not go in vain. We are a nation behind them and will take revenge for them.

"I call on my Muslim brothers everywhere... Those in Europe, kill the crusader pigs, each person to their own ability."

The 24-year-old had been asked to show his identity documents before pulling out a pistol on police who then returned fire hitting the suspect in the chest.

A major international manhunt had been launched for the Tunisian national who allegedly offered himself up as a suicide bomber for the Islamic State terror group before hijacking a truck and ploughing it into a Christmas market in Berlin.

The attack killed 12 people and injured dozens more but police initially arrested the wrong man giving the real perpetrator vital hours to escape.

Security officials have confirmed "without any shadow of a doubt" that the dead man is Amri after identifying him using his fingerprints.

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The terror suspect had stepped off a train from France moments before the routine stop in the suburb of Sesto San Giovanni.

Amri pulled a pistol from his backpack and shot one of the officers in the shoulder while reportedly screaming 'Allahu Akbar' before taking cover behind a car as he tried to flee the scene.

The other policeman – who had been in the job for just nine months – returned fire and shot the terror suspect in the chest.

After hearing of the shooting Amri's brother told a German reporter: "We are shocked and the whole family is in a bad situation. No comment."

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Speaking at a press conference in Rome, Italian interior minister Marco Minitti said: “During usual routine activity there was a police squad, they stopped someone who appeared to be a suspect.

“He immediately took a pistol out of his rucksack and shot at the police who asked him for documents.

"The person killed after a number of inquiries without any shadow of a doubt is Anis Amri, the presumed suspect of the terrorist attack in Berlin.

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"He was the most wanted man in Europe and we immediately identified him and neutralised him. This means our security is working really well."

The shooting will raise questions about how the suspect was able to travel from Germany to Italy despite a major international manhunt being launched.

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It is thought that Amri was radicalised in an Italian jail after meeting "extremist groups" when he was imprisoned for attempting to set fire to a school.

He had come to Italy by boat in 2011 after leaving Tunisia and told police he was a child refugee despite being 19 years old at the time.

The German federal public prosecutor's office said it is now in close contact with Italian security officials after the reports emerged.

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It comes just hours after he was apparently spotted in Denmark hundreds of miles away from the scene of the attack.

Danish investigators were probing the possibility that Anis Amri travelled there from Germany after allegedly killing 12 after hijacking a truck.

A man walking his dog last night tipped off officers that he had seen someone matching the description of Tunisian national Amri in another area called Grenaa.

The Tunisian national's ID papers were found underneath the driver’s seat of the truck he became the most wanted man on the continent.

Police initially arrested a Pakistani asylum seeker in the aftermath of the tragedy, police on Tuesday announced they had captured the wrong man and were instead hunting for Amri.

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A €100,000 reward was put up to catch the main suspect and investigators took the highly unusual step of releasing an uncensored picture of him to aid their search.

During his short time in Germany, he became linked to Abu Walaa, 32, a hate preacher whose sermons recruited young impressionable Muslims, sending them to Syria to fight for ISIS .

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Walaa was arrested in Hildesheim, in the north of the country, in November alongside four others for recruiting radicals.

Amri arrived in Europe via Italy in 2012 when he slipped in alongside Syrian refugees.

Security sources in Tunisia believe he then spent some years in prison in Italy over the burning down of a school before applying for asylum in Germany earlier this year.

His application was rejected but he was allowed to stay because of red tape.