A police officer stands in front of the Berlin Cathedral in Germany where police opened fire at a knifeman who was rampaging, wounding him in the legs.
The police statement urged people to "avoid speculation" and said more details of the incident would follow.
Police spokesman Winfried Wenzel told Bild: 'A person has been injured by a shot from a police weapon'.
The dpa press agency has reported the "rampaging" man's nationality as "Austrian" but police have yet to provide a name, disclose his ethnicity, or issue a physical description.
Mr Wenzel said the incident began when the man entered the Berliner Dom and waved a knife in the area of the altar.
The second officer was inadvertently wounded by the shot or shots fired by his colleague, Berlin police said.
Armed officers rushed to cordon off the entrances to the landmark.
"Based on what we know so far, we have no information that the suspect in any way had a terrorist or Islamist motive", said a spokesman.
The cathedral lies in central Berlin on the city's famous Museum Island.