National news agencies are reporting a truck has rammed into a crowded Christmas market in the center of Berlin, killing at least nine and causing multiple injuries.

The market is located in the center of Berlin, outside the landmark Kaiser Wilhelm Memorial Church.

The latest report from the Associated Press is that German police have arrested a suspect believed to be the truck's driver.

Police say they're still investigating whether the incident was an accident or a terror attack. No other details have been released. We'll be updating this developing story throughout the day.