A person is in custody following a report of a sexual assault in Bede Way, Peterlee, last night.
Peterlee CID have confirmed today that one man has been arrested in relation to the incident which took place at 10pm on Friday.
The complainant is said to be a woman.
Police were present at the scene this morning and a cordon remained in place while investigations were carried out.
A CID spokesman wished to reassure the public that this is an isolated incident.
Any witnesses are asked to contact Durham Police by calling 101.