A 46-year-old man was robbed and injured in Übach-Palenberg in the Heinsberg district when he tried to pick up a cell phone offered on the Internet.
A stranger hit him in the face with a gun, a police spokeswoman said on Tuesday.
The 46-year-old had seen an offer for a mobile phone online and wanted to pick it up on Saturday.
Übach-Palenberg - There, the alleged seller, according to the information, aggressively demanded his money and disappeared.
The stranger, who was wearing a balaclava, then threatened him at his car with a firearm and asked him to get out of the car and hand over his valuables.
Then he hit the 46-year-old and fled in his car.
The police asked for evidence on Tuesday.
It was initially unclear whether the woman was an accomplice of the masked man.
According to the police, the firearm was probably a blank gun.
dpa