Police arrested a 42-year-old Corio man on Sunday afternoon following a spate of armed robberies in one hour that morning.
A man allegedly armed with a gun terrorised staff at four Geelong businesses, Channel 7 reported Sunday night.
Detectives believed the alleged incidents began at local brothel Lorraine Starr early Sunday morning.
They alleged a man then held up a Caltex service station in North Geelong, escaping with an undisclosed amount of cash.
The man allegedly targeted a 7-Eleven on Bacchus Marsh Road and BP on Melbourne Road, both in Corio, shortly after.
The man remained in custody Monday morning and was receiving treatment for a pre-existing medical condition, a Victoria Police spokesperson said.
Police had yet to interview the man or lay charges.