(Sioux Falls, SD) — Police in Sioux Falls are investigating a pair of armed robberies that happened late Sunday night. The first happened shortly before 11 p.m. at the Corner Pantry on West 12th Street where a man with a gun walked out with cash. The next robbery was at Happy Jacks Casino on South Western Avenue a few hours after the first one. A man armed with a knife stole cash from the casino. Police have not indicated if there is any connection between the two robberies.