Three Sydney shootings not linked: police

Three separate shootings in Sydney overnight are not believed to be linked, police say.

The first shooting happened in Revesby, in Sydney's southwest, just after 7pm on Wednesday.

Two men were shot at while sitting in a parked car in what police believe could be a bikie-linked attack.

The shooters fled in their car while the vehicle with bullet holes was taken for forensic testing.

An hour later, several shots were fired into a home in Edmondson Park in the city's southwest.

A couple and their 15-year-old son were inside.

"One hit the front door of the home and another went through the front window," police said.

The family wasn't injured, but a crime scene has been established.

In the third incident, a 21-year-old man walking through a park in Rosebery in Sydney's south was fired at from a moving vehicle just before 10pm.

The man escaped injury and contacted police, who are continuing inquiries as to whether the incident was targeted.

AAP sjz/jca/tm/mge