Lucky's Party Store in Lansing has been robbed twice in the last two days.
A white man armed with a knife took cash from a clerk shortly before 1 p.m. Tuesday.
No description of the man is yet available.
At 9:45 p.m. Monday, a black man threatened a clerk with an unspecified metallic object and also escaped with money.
The suspect is described as 20-30 years old, 5'10", medium build.
He was wearing a black hoodie and had a white scarf on his face.
Police say the robberies don't appear to be connected.