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The 26-year-old Tunisian was detained at the scene after eight German commandos stormed the home in the Spandau district on Tuesday night.

A unit from the SAS trained GSG9 and the SEK anti-terrorist police raided the centre just before 9pm.

Prosecutors claim he “knew of the attack plans and possibly helped Anis Amri.”

The man, suspected to have been in contact with Amri "shortly before the attack", is said to have known the killer since 2015.