SIOUX FALLS, S.D. — Sioux Falls police say a man wearing a U.S. Postal Service uniform and an elderly man mask used a handgun to rob a business.

Authorities say the suspect in the Friday armed robbery took an undetermined amount of money. Officials didn’t identify the business that was robbed.

Police say the man entered the business carrying a package and mail and then pulled out a handgun and pointed it at two employees.

After getting the money, officials say the man left the business and drove away in what was described as a black SUV.

Sioux Falls police say the FBI is assisting with the investigation.