(WJBK) - The Oakland County sheriff's office is asking for help tracking down a suspected serial armed robber.
Authorities there say at least eight businesses have been held up at gunpoint over the past three weeks.
He's believed to be responsible for two robberies in Pontiac, including one at a Subway and another at a Thrifty Flowers.
Over the weekend, he was caught on surveillance camera at the Subway location in the 200 block of Walton Boulevard in Pontiac. He covered his face with a mask or a scarf.
The couple who owns the franchise was in there working at the time, and say the man demanded cash from the register. He got away with about $100. No one was hurt.
The Pontiac cases are among seven in Oakland County. The sheriff's office says two holdups were committed in Auburn Hills and three more in Waterford Township. One happened on Christmas Eve at a Dollar General Store.
Robberies also are being investigated in St. Clair County's Port Huron and Hartland Township in Livingston County.
If you recognize the suspect or think you know anything about these crimes, you're asked to call the Oakland County sheriff's office of 1-800-SPEAK-UP, where you'll remain anonymous.