Police had decided to disperse a camp of pro-Palestinian protesters in Dortmund after receiving information that Thunberg might visit it, a statement read on Tuesday.
"The Dortmund police have predicted a danger in connection with this meeting. The announced visit of Ms. Thunberg led to the conclusion that more people would gather at the event site than was announced. In addition, the time frame specified when registering the meeting would be violated. Recent events around Thunberg have led to her being assessed as prone to violence," the police said in a statement.
German media reported that Thunberg did not show up at the scene.