SIOUX FALLS, S.D.(KELO)- It was a case of a missing minor that turned into a rape investigation.

Sioux Falls Police arrested 20-year old Cornell Jones Wednesday.

They were looking for a missing 15 year old girl, and learned she had connected with Jones on Instagram.

Police Information officer Sam Clemens says they were found at a hotel on East tenth street.

Police are also investigating a pair of armed robbery cases at local casinos.

Clemens says in the first case, a gun was fired at a casino door when the casino was closed…but the glass didn’t break and two suspects left.

Later, they showed up at a casino on South Marion Road, when both had guns.

Clemens says police are hopeful to make an arrest on those cases soon.