Marathon County detectives have released the image of the type of mask used during the robbery at Wendy's in Rib Mountain.
They say one of the suspects wore a Teenage Mutant Ninja Turtles mask like the one pictured in this article.
The robbery happened early Monday morning. Employees reporting for work found two men inside the restaurant.
One had a handgun and the suspects duct taped the employees hands and ankles. They got away with an unknown amount of cash.
The man wearing the "Ninja Turtles" mask is described as about 5'10" with a stocky build. He was wearing a navy blue hooded sweatshirt and a dark t-shirt underneath.
The other man is described as 5'11" with a slender build. He was wearing a dark, hooded sweatshirt and black ski mask.
If you have any information, call the Marathon County Sheriff's Department at (715) 261-1200.