The force was made aware of the letters being displayed in Clabon Road, Norwich, on Friday.

The letters featured a police logo, a false crime reference number and were signed off by an officer who is not employed by the constabulary.

They claimed there were "sexual predators" living in the area and urged locals to report any suspicious behaviour.

The letters were removed by officers and Norwich Police issued a statement which said: "We have been made aware of letters being displayed earlier today on Clabon Road, Norwich, which claim to be from the police.

The letter appeared in Clabon Road on Friday (Image: Norwich Police)

"We can confirm that these letters are not genuine.

"The crime reference number is not real.

"The collar number and surname shown on the letter do not correspond with any police officer employed by the constabulary.

"Officers have attended to remove the letters.

"Of course, if you do have any concerns about suspicious activity in your local area, please report it to us through the usual channels.

"In an emergency, always call 999.

"For non urgent matters, contact us on 101 or via our official online reporting tools.

"Thank you for your continued vigilance and support."

© Norwich Evening News