This is the chilling moment a woman was arrested after 18 people were injured in a horror train station knife rampage in Hamburg that left four victims fighting for their lives.

Police confirmed they had arrested a 39-year-old German female suspect in connection with the stabbing spree at Hamburg Central Station on Friday afternoon.

Footage of the arrest shows a hooded woman wearing tracksuit bottoms being dragged away from the travel hub by two cops and escorted into a police van as members of the public watch in horror.

The suspect, who has not been named, does not appear to put up a fight.

She is believed to have acted alone and there was no sign of her having a political motive. The rampage is not being treated as a terror attack.