This is exactly what a beachhead is for, planning operations against the non-Muslim society.
Berlin truck attack: mosque shut down amid anti-terror raids
Hundreds of police officers sweep locations across city in searches linked to mosque frequented by attacker Anis Amri
A mosque used by the Berlin Christmas market truck attacker, Anis Amri, has been shut down by German authorities amid a series of police raids in the hunt for other radical Islamists.
The prayer rooms of the Fussilet 33 mosque in the central district of Moabit was a known meeting place for men and women who moved in Islamist circles.
More than 460 police officers swept 24 other locations across the city in the early hours of Tuesday morning in raids linked to activities at the mosque, where it is suspected money was regularly collected to fund terror attacks in Syria.
Amri, who carried out the attack on 19 December in which 12 people died and more than 50 were injured, was a regular visitor to Fussilet 33, along with other Islamists police believe were willing to carry out further terrorist attacks.
Members of the mosque – mostly of Turkish or Caucasian origin – were allegedly radicalised there and recruited to fight for Islamic State in Syria.