A late-night robbery of a casino in southwest Sioux Falls has police looking for suspects.

Investigators say three men robbed the Black Diamond casino at 5113 West 41st Street just after 11pm Monday.

Police say one man opened the back door and held it, while two others wearing masks, gloves and hoodies entered the establishment with a handgun, demanded cash from the clerk and then ran out the back door with an undetermined amount of money.

No one was injured.

The man at the door is desdribed as wearing a dark sweatshirt, blue jeans, black sneakers with white toes and a two-tone cap with large lettering.

One of the men who robbed the casino wore a white zip-up hoodie with multi-width horizontal stripes, blue jeans and black shoes with white laces, and he carried a black or silver handgun.

The other robber wore a dark hoodie with a dark undershirt, black shoes and white gloves, and he put the cash in a white or lighter-colored bag.