Shepparton Crime Investigation Unit detectives have arrested a man following a fire in Mooroopna this morning, Victoria Police say.
Emergency services were called to a McLennan Street supermarket just before 7.30am when workers noticed the fire in one of the aisles.
Investigators believe the man allegedly started the fire in the cleaning aisle of the store after setting alight toilet rolls.
No one was injured in the fire although the store has been extensively damaged.
The 50-year-old Mooroopna man is currently being interviewed by investigators.
Anyone with information about the fire is urged to contact Crime Stoppers.