"Correspondence from the Moroccan security agencies had a clear warning about the Tunisian man`s desire to carry out a terrorist act," the official says.
German authorities say that the investigation into the attack, which saw a truck laden with steel plough through a Berlin Christmas market late Monday, will now focus on whether Amri had accomplices or a support network.
The attack has been claimed by Daesh. Its semi-official Amaaq news agency published a video on Friday purportedly showing Amri pledging allegiance to the group`s leader.
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