SACRAMENTO (CBS13) — Police believe a single suspect may be to blame for a series of armed robberies at fast food restaurants, including three hold-ups Sunday morning and at least two Sunday night.

The Sacramento Police Department said a male black adult, about 6 feet tall with a stocky build and long, wavy hair, robbed a Burger King on Freeport Boulevard, a Del Taco on K Street and a Jack in the Box on Florin Road after 7:00 a.m. Sunday.

Authorities received reports of another robbery just after 9:14 p.m. Sunday at a Del Taco at 2525 Watt Avenue, and yet another hold-up after a McDonald’s may have been robbed a short time later.

The same suspect is believed to be responsible for a Saturday morning robbery on Stockton Boulevard, a Thursday morning robbery near 26th Street and Broadway, and a Wednesday morning robbery at the same Burger King that was hit Sunday morning.

Investigators believe other unsolved robberies were also carried out by the same suspect; if so, it would bring his total up to 10.

“At this point it seems to be one person, the description is similar and it’s a similar method,” said Sacramento police Lt. Eric Poerio.

In most of the incidents, the suspect walked into the restaurant wearing a ski mask and brandishing a handgun, demanding cash from the businesses’ safes.

Police believe the suspect is using a vehicle to flee the scene, but are not sure if he has an accomplice.

No injuries have been reported thus far.

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Police say the suspect appears to be husky and wears his hair in dreadlocks.  He has also been seen wearing a blue jacket in some of the robberies.