Police say four passenger planes were targeted by laser lights on Friday night as they were trying to land at Sydney Airport.

The first incident happened just after 8:30pm (AEST) when a Boeing 767 was flying into the airport. Police say a green laser was pointed at the aircraft.

It happened again with three other planes on their approach about an hour later. All the planes landed safely.

Police say the beams were reported to have come from the Bankstown area, with one apparently coming from a reserve at Georges Hall.

However, a police patrol of the area shortly afterwards failed to find any trace of those involved.

A laser was also pointed at a passenger plane as it was trying to land at the airport on Wednesday night, but came from the Mount Annan area in the city's south-west.