Spiegel reported that eyewitnesses saw people bleeding on the ground, but there has been no confirmation from police.
An unknown man attacked train passengers with an ax at the central train station in Dusseldorf, Germany Thursday, according to various reports.
A federal police spokesman said two suspects had been arrested in connection with the attack.
"We were standing on the track, waiting for the train", a station attendant told the German newspaper Bild.
As many as five people are reported to have been hurt, although the extent of their injuries is not yet known.
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Anti-terror police sealed off the German city's main train station when the attack happened at around 9pm local time (8pm United Kingdom time).
The spokesman said it was too early to say whether the incident was a terror attack.
Bruno Macedo tweeted: 'Man with axe chased by police in Dusseldorf. The train station was closed as federal, regional and local police scoured the station.
Trains are reportedly not stopping at the station.