Police hunt gunman after fatal inner-city shooting

He died at the scene.

investigators are working to establish the circumstances surrounding the man's death. (James Ross/AAP PHOTOS)

Investigators have set up a crime scene around the area, close to a train line, a major road and a creek.

In a statement, Victoria Police said investigators were working to establish the circumstances surrounding the man's death.

No arrests have been made.

Anyone with relevant footage or who saw what happened has been urged to contact investigators.