An elderly woman who was sexually assaulted in a Geelong aged care home has been described as a "fighter" by police.
The 90-year-old was assaulted in bed at the facility in St Albans Park about 4.45am on Sunday.
Sexual Crimes Squad Detective Acting Inspector Mark Burnett said she was able to set off an alarm during the assault.
"She's a fighter, she fought the attacker, she was able at one point to activate her personal distress alarm," he told reporters.
Detective Burnett said nurses who confronted the man and scared him off had also shown courage.
But he said the incident was "very confronting" because the victim was vulnerable, and has been left shaken and injured.
The police investigation is in its early stages and a forensic team is collecting evidence at the home, while uniformed officers and the dog squad are patrolling the area.
It's not yet known how he managed to get inside the home.
The man is believed to be aged between 20 and 25, thin, fair skinned, about 163cm tall and wearing dark coloured clothes and a red beanie.
Detectives are urging anyone in the surrounding area who may have CCTV or dashcam footage to come forward.
