A clerk was stabbed during a robbery at Eastern Market Convenience Store in Willimantic, which is about a mile away from Eastern Connecticut State University.
Police said they responded to the convenience store on Main Street around 12:45 a.m. Tuesday and learned that a man forced the male clerk to open the register.
Surveillance video from the scene shows the clerk put money in the robber's backpack, then struggle with the robber and get the gun away from him.
The video also showed the clerk going after the robber with a baseball bat as the man fled the scene.
Police said the clerk was stabbed once in the leg during the struggle.
The robber left on foot with cash and merchandise and the clerk was transported to Windham Hospital. He has since been released.
The robber appeared to be between 26 and 32 years old and was wearing gray sweatpants, a black jacket and black ski mask.
Anyone with information should call the Willimantic Detective Division at 860-465-3135.