Police have released footage of a luxury boat which was incinerated as part of an alleged extortion attempt.

On July 11, two men showed up at a woman’s home at Hurstville, in Sydney’s south, demanding cash.

The 48-year-old refused and was allegedly threatened by the men who had become aggressive.

One week later, a luxury boat parked out the front of the property was set on fire, with footage witnesses capturing shocking footage of the blaze.

The $150,000 boat was completely destroyed and specialist forensic officers found a knife dumped nearby.

Less than a week after that incident, a man returned to the property and allegedly punched the woman in the face after again demanding cash.

Detectives have now released a sketch of the man who was seen nearby at the time of the fire and assault.

He’s described as Middle Eastern, aged in his mid-20’s, about 175cm tall, with a medium build, dark beard, and tattoos on his neck and both hands.

Investigators are also searching for a 2018-model white Mercedes sedan with a dark sunroof which was at the scene.