The PSNI has arrested a man aged in his 30s in connection with a sexual assault.
Police said a woman was pulled into an alleyway and repeatedly hit in her face during the attack in Londonderry.
A PSNI spokesperson said that a man was arrested on suspicion of related offences and remains in police custody at this time.
The assault occurred during the early hours of this morning, Sunday 27 October, at approximately 1.15am in the Lecky Road area of the city.
The woman, aged in her 50s, was approached by an unknown man who pulled her into a nearby alleyway where he sexually assaulted her, and also repeatedly hit her to the face and banged her head off a wall.
Detective Chief Inspector Crothers said: “She sustained serious facial and other injuries as a result of this terrifying ordeal that she was only able to escape from after her attacker let her go.
“The woman was able to then raise the alarm for help and the suspect fled the scene on foot.
“She required hospital treatment for her injuries and has understandably been left extremely distressed and shaken by what happened. Specialist officers will continue to support her.
“Our enquiries are continuing today and as such you will notice an increased police presence in the area.
“The suspect is a white man, of broad build with dark hair and was wearing a dark short puffer style jacket and light-coloured trainers.
“We are appealing to anyone who may have been in the Lecky Road area this morning between 1.15am and 1.35am and witnessed what happened or noticed anything suspicious to make contact with police on 101, quoting reference number 323 27/10/24.
“We would also be especially keen to hear from anyone who may have dash-cam, CCTV or mobile footage of the area during this period of time that we could examine.
“Due to the hour change this morning – CCTV, home and car recording systems may contain footage that is appropriately timestamped to reflect that. Please take this into account when you are reviewing all relevant material.”
SDLP Foyle MLA Sinéad McLaughlin said: “This must have been an absolutely terrifying experience for the woman involved.
“My heart goes out to her and I hope that she makes a quick recovery from her injuries, though this will no doubt have a lasting impact on her life.
“Women should be able to feel safe walking the streets of our city without being subjected to a horrific attack of this nature.
“I’d urge anyone who was in the area or has any information to contact police immediately so this perpetrator can be apprehended and stopped from hurting anyone else.”
A report can be submitted online using the non-emergency reporting form via http://www.psni.police.uk/makeareport/ or you can contact Crimestoppers anonymously on 0800 555 111 or online at http://crimestoppers-uk.org/