GREEN BAY, Wis. (WBAY) -- The Green Bay Police Department is looking for the man who robbed a Subway restaurant on the city's west side -- and possibly others.
It's the latest in a series of restaurant and store robberies carried out by a man armed with a knife.
According to police, the robbery happened at the Subway at 1007 W. Mason Street just before 8 p.m. Thursday.
Police say they are studying surveillance video of the robbery.
"A lone person walked in, held the clerk at knife point, and took an undisclosed amount of cash from the store. The clerk was told by the person to go into the freezer. We are still analyzing video from the business, the neighboring businesses, and trying to make the connection, so to speak, like the other ones to see if we have the same person doing it," says Lt. Rick Belanger, Green Bay Police Dept.
The employee was not locked inside the freezer. No one was hurt.
The suspect is described as 5'8"-5'10" with a medium-to-heavy build. He's believed to be Hispanic or Native American.
Police believe this crime could be linked to a series of robberies involving the knife-wielding suspect.
"We're very anxious to catch this person and hold them accountable. Our detectives are working. We have some top-notch detectives assigned to this case. They're following up on all the clues that we're getting but we really need the community's help to find this person," Chief Andrew Smith says.
Here's a timeline of similar crimes in the Green Bay area:
Dec. 5: a man with a knife robs a Cousins Subs store on W. Mason Street in Green Bay.
Dec. 10: a man with a knife robs a Subway in Ashwaubenon.
Dec. 11: a suspect uses a knife to rob a Dollar General store on S. Military Avenue in Green Bay.
Dec. 11: a man enters a Shell station at 841 Main Ave in De Pere and threatens a clerk with a knife. The man gets away with cash.
Dec. 18: a man with a knife robs a Burger King restaurant at 1005 S. Military Avenue.
Police think the same man staged another robbery, but was intimidated by gun posters on the wall of the business.
"Bad guy walking in and seeing some kind of gun stuff and kind of spooking the guy into getting back out of the business so he doesn't get shot. It was not a gun store. It was strictly a real small business and they kind of have posters indicating, 'gun, this' and I mean this is really basic stuff, but it was enough to potentially scare him off which I think is kind of neat," Belanger says.
Police say in all cases, employees did the right thing. They handed over cash and followed instructions to stay alive.
If anyone has information concerning this case, call the Green Bay Police Department at (920) 448-3208.
You can remain anonymous and may be eligible for a reward by contacting Green Bay Area Crime Stoppers by phone at #920-432-7867, through their website at 432stop.com, or by downloading the P3 tip app through Google Play or the App Store.