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The off-duty copper reportedly leapt out of his car brandishing a knife and chased the two British men, aged 19 and 24, because they were 'crossing the road too slowly'.

The pair had apparently angered the officer as he was driving in the Neukolln borough of the German capital at around 3.45am local time on Sunday.

According to a statement from the city's chief of police, he followed the pair before punching the older man in the face and stabbing him in the buttocks.

The 24-year-old injured in the skirmish was taken to hospital, but has since been discharged. Both men have reportedly returned to the UK.

(Image: GETTY)

The off-duty officer claimed the British men attacked him with a knife and that he needed treatment for a cut to his hand.

The 29-year-old officer is now under investigation for carrying an illegal weapon, according to reports in Germany.

Police are reportedly refusing to comment on whether he will continue to serve while the investigation takes place.

It is not known whether the two Brits are going to press criminal charges.