Detective Inspector Tracey Cormack said the force is appealing for anyone who may have witnessed the offences or think they may have been approached by the man in question to tell police.
“On Wednesday, at around 5.30pm, the teenager was walking along Sandhurst Road, when a man, who was riding a bike, approached her claiming to be a police officer.
“He told her she fitted the description of a shoplifter and was going to search her. As he carried out this search he raped her and threatened her with a knife.
“Detectives are linking this attack with another incident in Shirley Grove, at around 4.30pm on Wednesday where a man on a bike approached a 12-year-old girl.
“The man claimed to be a police officer and told the girl she fitted the description of a female that he needed to arrest.”
Officers say the suspect was not wearing any police uniform. Last week a man pretending to be a policeman approached five different schoolgirls in just 24 hours in Hornsey. Four girls, aged 11 to 14, were approached separately by the man as they walked to school on Monday. The suspect was described as black, of a medium build and with short black hair. He was wearing a jacket with the hood up and is thought to be aged between 20 and 30. None of the girls approached were injured and their relevant schools were spoken to by the police.
