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A suburban commuter train in Munich was struck by terror this morning as a knife-wielding man stabbed and killed one passenger, and seriously injured three others.

Harrowing images from the scene show the platform covered in blood as forensics probe the area following the 5am attack at Grafing train station.

Eyewitnesses say the young man was screaming "Allahu Akbar" during the alleged attack.

Such was the panic at the station that personal items such as mobile phones can be seen left abandoned by passengers as they fled.

Authorities have identified the suspect only as 27-year-old "Paul H".

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It is claimed the suspect is of an immigrant background and not known to the German police.

He was arrested soon after the incident, which took place at Grafing S-Bahnhof in the suburban Ebersberg area of the city.

(Image: Google)

Speaking to Bild newspaper, a police spokeswoman said that the knifeman - who has been arrested - had to be "overpowered".

Photographer Stefan Rossmann, who lives 3km away from the station, was at the scene.

He said: "The few locals who were at the scene were absolutely horrified.

"One of the victims – who is critically injured – is a very active member of the community and delivers the local paper.

"Everyone knows him."

A statement from police read: "After the incident, an alleged offender could be overpowered and arrested."

Authorities are now working to identify the man.

It is feared that the commuters allegedly attacked by the man are suffering from life-threatening injuries.

Authorities confirmed that significant delays are to be expected at the station today while police continue their investigation.

On social media, users took to Twitter to offer their support to the victims.

The knifeman was arrested "on the spot" after the incident.