Lecky Road Flyover where the assault occurred.
Police in Derry are appealing for information about an alleged assault in which a woman required hospital treatment for head injuries.
The incident occurred between 12.30am and 1.00am on Sunday, 24 August on the Lecky Flyover.
She required hospital treatment for a perforated left ear drum, and soft tissue damage to her face and head area.
A PSNI spokesperson said information could be given to Constable Brian Devine on the police non-emergency 101 telephone number.
Alternatively, it can be provided to the Crimestoppers charity anonymously on 0800 555 111.
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