Two people have been arrested in connection to a shooting at a police facility in Melbourne's north.

It comes after a drive-by shooting at a police impound lot on Tuesday night, which may be connected to the seizure of a car belonging to an associate of the Hells Angels bikie gang.

On Wednesday, detectives from the Echo anti-bikie taskforce and Darebin raided two properties and seized two stolen cars, and another to search for forensic evidence.

Seven shots were fired into the building in Preston at 11.50pm on Tuesday while two unarmed and unsworn employees were inside.