COLORADO SPRINGS, Colo. -

Colorado Springs police are investigating a robbery at the Subway on the 8600 block of North Union Boulevard. 

It happened at 7 a.m. Monday. 

Police said the suspect took an undisclosed amount of cash and ran out the back door.

The initial description of the suspect is that he is a white man, in his early 20s, wearing a black ski mask, black hooded sweatshirt and black pants.