German police are searching dozens of sites across Berlin linked to a mosque visited by the truck attacker Anis Amri.
The raids follow a decision by state authorities today to ban the organisation that ran the mosque, Fussilet 33.
Police said some 450 officers began searching 24 locations including several apartments, two company offices and six prison cells at 6 AM.
Authorities had been monitoring the mosque, which closed last week, because they believed it was frequented by Islamic extremists and used as a hub for funneling people and military equipment to conflict zones.
Amri, a 24-year-old Tunisian, killed 12 people when he plowed a stolen truck into a Christmas market December 19. He was shot dead by Italian police four days later.
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