Authorities in Germany are trying to figure out what triggered a blast at a police station in Berlin late on Thursday evening, but do not believe the explosion was part of an intentional attack. A policeman suffered injuries to his face and eye and underwent an operation in hospital overnight,

Several people intervened after the suspect began stabbing people in the German capital's Charlottenburg neighborhood, a Berlin newspaper said. A Syrian national who lives in Sweden was arrested.

Two men have been injured in a knife attack in western Berlin, German police said on Tuesday. A man reportedly attacked several people on the street in the western district of Charlottenburg, a police spokeswoman said,