DETECTIVES have opened up a rape investigation following allegations a woman was sexually assaulted at a house.

A 29-year-old man arrested on suspicion of rape following the incident which is alleged to have happened in Blackburn on Sunday night.

A police spokesman: “An investigation has been launched following a report of rape in Blackburn.

“We were called at approximately 10.30am on August 13 to reports a woman had suffered a serious sexual assault at an address in Shadsworth.

“A 29-year-old man from Blackburn was arrested on suspicion of rape a short time later. He has since been bailed until September 8.

“Enquiries are ongoing but it is believed the victim and the arrested man are previously known to one another.”