The wanted man.

A scooter rider captured on camera at North Melbourne train station prior to a peak-hour bomb scare is wanted by police after the incident led to the cancellation of a string of morning train services.

Victoria Police spokeswoman Leading Senior Constable Melissa Seach said Transit Crime Investigation Unit detectives are hoping to identify the man after a suspicious device was located on a platform early Thursday.

"Police have been told a man got off a Craigieburn line train at North Melbourne Railway Station about 6am," she said.