Police in Germany sealed off Duesseldorf's main railway station late on Thursday evening following reports of an axe attack.

"There was blood everywhere", the agent said.

"We were standing on the track, waiting for the train". "I've never seen anything like that in my life, directly next to me he started hitting people with an ax".

"I helped her wound and called her father", she said.

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"Several people" are believed to have been injured and images posted on social media showed paramedics treating the wounded.

German newspaper Bild reported that a suspect has been arrested in connection with the attack.

Heavily-armed special police forces swooped in on the station, located in the center of Germany's ninth-largest city. "Stay away from #Dusseldorf train station insane man with #axe on the lose".

Emergency vehicles filed through Konrad Adenauer square outside the station entrance. The rail station remained shut down, he added.