Customers were threatened by a man holding a knife at a Kitchener McDonald's restaurant Monday evening, police say.

Police were called to the restaurant at 8:20 p.m. after a man and a woman entered the restaurant. The man was holding a knife while threatening customers, then the two fled the area before police arrived.

Police released this photo of a man who allegedly threatened customers at a Kitchener McDonald's with a knife Monday night. (WRPS) The man is described as white, in his mid 20s, five-foot-eight with a thin build. He had short or shaved hair and appeared to have stretched earlobe piercings. He was wearing dark jeans, a DC hooded sweatshirt, a grey coat and black sneakers.

The female is described as white, in her late teens or early 20s, with straight, dark hair. She was wearing a black hooded sweater and black tights.

Police released a photo of the male suspect and have asked anyone who knows the identity of either of the two people or who may have details about the case to contact authorities.