Days after the December 19 attack, Tunisia's interior ministry announced the arrest of the nephew of Anis Amri, the suspected Berlin attacker, and two others.
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Prosecution spokesman Sofiene Sliti told AFP on Saturday that a fourth man had been also arrested.
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"The investigations have shown that none of them had any link to the Berlin attack and that they don't belong to any jihadist group," he said.
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Three have been released while Amri's nephew is still being held as part of another investigation into his "intention to join jihadist groups abroad," Sliti added.
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The interior ministry said on December 24 that the suspects were arrested for links to Amri but that there was no direct link between them and the attack on a central Berlin Christmas market.
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It said that Amri's nephew - who has not been named - admitted being in contact with his uncle through the messaging service Telegram.
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Amri allegedly urged his nephew to adopt jihadist ideology "and asked him to pledge allegiance to Daesh (IS)," it said.
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The nephew also told investigators that Amri "sent him money through the post... so that he could join him in Germany."
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The nephew was reported to have said that Amri was the "prince" or leader of a jihadist group based in Germany known as the "Abu al-Walaa" brigade.
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Amri, 24, is believed to have hijacked a truck and used it to mow down holiday revellers in an attack that left 12 people dead.
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The attack was claimed by the Islamic State group.
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Amri was shot dead after firing at two Italian policemen who had stopped him for a routine identity check near Milan's Sesto San Giovanni railway station on December 23.
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