Woman assaulted at knife point in NSW

Police are appealing for the public's help in identifying a man who allegedly sexually assaulted a woman at knifepoint in the Lake Macquarie area.

The 25-year-old woman was grabbed from behind at Speers Point at 7.30pm on Sunday before being threatened with a knife and assaulted, police said.

The man is described as having a skinny build, wearing white shoes a dark blue jumper and dark pants.