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The shooting reportedly happened at the Unterfoehring subway station in the city this morning.

German media is saying a police officer was killed after a passenger apparently snatched her gun and shot her and point-blank range in the head.

Four other people have reportedly been injured after being shot.

Police helicopters circled above the crime scene after officers flooded into the area.

(Image: GETTY) (Image: TWITTER) (Image: Twitter) (Image: GETTY)

Trains around the station were reportedly stopped and the entire area has been cordoned off.

The gunman is said to have opened fire during a routine ID check.

Munich police wrote on Twitter: "At least four other people were wounded. One person was detained."

Officials have not given further details on a motive but said they do not believe it is terror related.

(Image: Twitter) (Image: TWITTER) (Image: DS) (Image: TWITTER)

Pictures and videos taken at the scene show swarms of police vehicles surrounding the underground station.

Other grim photos taken inside the station show blood spatters on the ground.

The attack comes nearly a year the Munich Olympia shopping mall massacre.

Bullied loner Ali Sonboly went on a shooting spree, killing nine, after first luring teenagers to a McDonald's via Facebook.

The warped killer is reported to have emerged from the bathroom in the fast-food chain before unloading a round from a Glock 17 handgun.

In his red backpack, the German-Iranian 18-year-old was carrying 300 rounds of ammo, moving from the McDonald’s to the nearby Olympia Einkaufzentrum shopping centre before reportedly fleeing into the metro system.

(Image: GETTY)

(Image: GETTY)

In Dusseldorf, five people were injured when an axeman went on a rampage through the city's main train station earlier this year.

A passenger described seeing a "crazy man" start attacking people at around 8pm on March 10.

Cops arrested two people over the horror attack.