Officers are appealing for a man who intervened when a woman was assaulted by a man in Darlington to come forward.
The woman was walking down Duke Street, in Darlington, shortly after midnight on Saturday morning (December 18) when she was assaulted by a man at the junction of Raby Terrace.
A passer-by who saw what was happening intervened and her attacker ran off.
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A spokesperson from Durham Constabulary issued a plea for the man, or somebody who knows him, to come forward to help with their ongoing enquries.
They stated:
"We would like to trace this Good Samaritan as he may have vital information which could assist our investigation.
"Are you this man, or do you know who he is?"
"If you can help, please contact Detective Constable Mike Hutchinson at Darlington CID on 01325 742868 or via email at Michael.hutchinson@durham.police.uk."
A 50-year-old man has been charged in connection with the incident.
He has been remanded in custody to appear at Teesside Crown Court on January 24.
