DETECTIVES are urging three groups of friends seen walking near the site where a teenager was allegedly raped to come forward.

An 18-year-old said she was attacked by a man in William's Walk, off East Stockwell Street in Colchester's Dutch Quarter, between 2.30 and 3am on June 15.

Last Thursday, a 21-year-old was arrested in connection with the incident, and is currently on police bail until August 5, pending further inquiries.

Anyone with information is urged to call Colchester CID on 0300 333 4444 or Crimestoppers on 0800 555 1111.