Police are investigating a break and enter and sexual assault in North Lambton on Thursday.

A 20-year-old woman was insider her bedroom at her home on Turana Parade when a man entered the room with a knife and threatened her.

She attempted to alert her neighbours before the man grabbed her and sexually assaulted her.

Police say a short time later, the man fled on foot and the woman sought assistance from other residents, who contacted police.

A crime scene was established by Newcastle City Police Officers.

Detectives have commenced an investigation under Strike Force Oorin, with assistance from the State Crime Command’s Child Abuse and Sex Crimes Squad.

The man is described as being of Caucasian appearance, aged in his early to mid-20s, of a solid and athletic build, with a broad nose, short black hair and unshaven.

As investigations continue, police are urging anyone who may have CCTV or dashcam footage from Turana Parade, Lester Parade, Faulkner Crescent, Sunset Boulevard and University Drive between 1pm and 5pm Thursday 29 July or who may have information which could assist investigators to contact Newcastle Police or Crime Stoppers on 1800 333 000.