UPDATED, 3.18pm: Tweed Detective Brendon Cullen has warned a man who restrained and sexually assaulted a 75-year-old Kingscliff woman to turn himself in.
The woman was found by flat mates about 9pm, an hour after the 15-minute-long attack.
"We're very concerned there's someone out in the community who would do such a thing," Det Insp Cullen said.
"He should hand himself in now rather than let the police find him, because I am confident that we will find him.
"We'll do everything we can to track him down."
The 75-year-old woman was released from hospital this morning, traumatised by the attack.
Det Insp Cullen also said initial investigations indicate the woman did not know her attacker.
Tweed Police do not know if the man responsible escaped the area on foot or by car.
The attacker is described as being of Caucasian appearance, aged in his late 30s, 180cm tall with a thin build, short light-brown hair and wearing a distinctive grey-coloured PING brand baseball cap and a white t-shirt.
Anyone with information should contact Crime Stoppers on 1800 333 000. Callers can remain anonymous.
INITIAL report, 1.52pm: AN elderly woman has been sexually assaulted during a violent home invasion on the north coast of NSW.
Police said the 75-year-old woman was assaulted after answering a knock at the door of her Kingscliff unit about 8pm on Wednesday.
When she opened the door a man forced his way into the unit before sexually assaulting her and then fleeing the scene.
Police were called to the unit about an hour later, where they established a crime scene which was examined by specialist forensic officers.
The woman was taken to Tweed Hospital for treatment.
Detectives from Tweed/Byron Local Area Command are investigating the assault and appealing for anyone who saw the man in the vicinity of Kingscliff St about 8pm to come forward.
He is described as being of Caucasian appearance, aged in his late 30s, 180cm tall with a thin build, short light-brown hair and wearing a distinctive grey-coloured "PING' brand baseball cap and a white t-shirt.
Anyone with information can call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page: https://www.police.nsw.gov.au/.