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A couple at a German music festival have been attacked by a knifeman who witnesses claim was heard shouting "Allahu Akbar".

A 66-year-old woman, believed to be the other victim's wife, is said to be fighting for her life.

The other victim - a 57-year-old man - is seriously injured however he still managed to overpower the man who was then arrested by police officers in Oberhausen.

The attack took place just after 7pm on Saturday evening.

Police officers say the suspect is a 26-year-old from Duisburg, Germany.

(Image: Getty) (Image: Google Maps)

In a statement, police said the suspect was "apparently under the influence of narcotics".

Officers say they have also recovered a weapon from the scene.

German media reported that the suspect is homeless.

The phrase "Allahu Akbar" means "God is Great" and has been chanted by Islamic terrorists during attacks.

However officers are yet to confirm a motive for the attack.

(Image: twitter)

The country has been on high alert for months and has suffered a spate of chilling attacks.

In June, a police officer and his wife were stabbed to death in Magnanville, France.

The killer, who pledged allegiance to ISIS, brutally slaughtered police chief Jean-Baptiste Salvaing and his wife at their home last night.

In July a 17-year-old Afghan refugee seriously injured five people with a knife and hatchet on a train near Würzburg in Germany. The attacker was shot dead when he attacked police officers

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On July 24 a suicide bomber detonated an explosive device outside a wine bar in Ansbach, Germany, 15 people were injured, four seriously.

He recorded videos showing him pledging allegiance to ISIS and its leader Abu Bakr al-Baghdadi.

Two days later a priest was murdered and four nuns were taken hostage in a church in Rouen, France.

The two terrorists were shot dead.

(Image: Getty) (Image: Twitter)

Father Jacques Hamel, 85, was made to get to his knees before he was brutally butchered at the Church of the Gambetta in Normandy, said a nun who escaped the attack.

His two murderers - one of whom has been named as 19-year-old Adel Kermiche - captured the slaying on a mobile phone, according to Sister Danielle, who was one of several worshippers taken hostage during morning mass.