As of Monday afternoon, a man (a facial composite of the attacker pictured above) accused of raping a young woman in Siegaue Nature Reserve had not been found by police

Police in western Germany are searching for a man who is suspected of raping a young woman on a nature reserve after threatening her and her boyfriend with a machete.

The young couple were on a camping trip in the Siegaue Nature Reserve, north of the former German capital of Bonn when they were approached by a man at about 12.30am on Sunday.

The man had approached their tent holding a large knife - believed to be a machete - and threatened the couple before demanding the 23-year-old woman leave the tent with him, according to police.

He then raped the woman in front of the tent before running off in the direction of the Rhine River, police said.

The woman’s 26-year-old boyfriend, who had also been threatened by the man, contacted police and medical responders took her to the hospital.

A medical assessment performed on Monday confirmed that the woman, who has not been publicly named, was raped, according to The Local.

A young couple were camping in the Siegaue Nature Reserve, north of the former German capital of Bonn when they were approached by the man, who threatened them with a machete before raping the woman on Sunday

Police are now searching for the man accused of raping the woman, who is described as a dark-skinned male between 20 and 30 years old. He is believed to be 5ft 9in.

At the time of the crime, the man was wearing light denim jeans and a jacket. The couple said that he spoke broken English.

As of Monday afternoon, the man had not been located by investigators, despite helicopters and sniffer dogs trying to track him.

People who have information relating to the incident have been asked to call police at 0228-15.