At least five people have been injured after an axe-wielding man went on a rampage at a Dusseldorf train station.
Two people have been arrested and German anti-terror police believe that others are now on the run.
Reports claim that one of the attackers ran towards a nearby underground station and jumped from a bridge as they attempted to flee.
Pictures from Düsseldorf Hauptbahnhof, the city's main station, showed one of the victims lying helplessly on the floor as paramedics rushed to their aid.
Police could not confirm how serious victims' injuries are, but some were seen treated in ambulances at the scene.
A station attendant told German newspaper, Bild, that a man had attacked people after jumping off a train.
They said: "We were standing on the track, waiting for the train. The train came, and suddenly someone jumped out with an ax, hit the people.
"There was blood everywhere. I have experienced a lot, but I have never experienced it."
Earlier this evening a terrified passenger claimed on Twitter that a 'crazy man' attacked people in the station.
Bruno Macedo tweeted: 'Man with axe chased by police in Dusseldorf. Station closed. I am in the train things look bad #police #terror.'
Macedo added: "Stay away from #Dusseldorf train station crazy man with #axe on the lose .. :("
He later posted: 'Everyone is calm in the train. Tense but calm....#dusseldorf #breaking #terror
"Train is not stopping in #Dusseldorf #police closed the station . #terror #germany"