Man abducted in southwest Sydney overnight

The state's robbery and serious crime squad are assisting Bankstown detectives while investigations continue into a Greenacre car fire hours later. 

The vehicle was set alight in an open carpark at a Lawford Street unit block on Monday about 1.25am, spreading to a second car before it was extinguished by firefighters. 

Authorities are calling for anyone with information or who may have dashcam footage of the incidents to come forward.