The Daily Star's FREE newsletter is spectacular! Sign up today for the best stories straight to your inbox Sign up today! Thank you for subscribing See our privacy notice Invalid Email

(Image: TWITTER)

The crash in the Duisburg – a city in north-west Germany – left around 23 people injured, according to local reports, two of which were in serious condition.

One was said to have sustained a serious head injury when one train crashed into another at around 3pm, while most have suffered cuts and bruises.

"It has gone off lightly, the slightly injured persons have fallen and have suffered bruising," a spokesman for the fire department told a local newsaper.

(Image: TWITTER)

The collision took place in the tunnel at "Auf dem Damm" station in the Meiderich quarter, which is an underground Stadtbahn Rhein-Ruhr station.

Dramatic pictures showed an entire pane of glass from one of the trains smashed on the track, with damage clearly visible on both trains.

A passenger on the train told a local newspaper: "I got up to get out, then it crashed and I flew around, lots of people screaming and panic broke out.

"After a few minutes, a member of the DVG (local transport company) came and took us outside."

It is still not yet clear what caused the crash.