The South Dakota State Fire Marshal’s Office is investigating a house explosion that killed a baby and her grandparents and left two young children hospitalized with burns.
The house about 11 miles (about 18 kilometers) southwest of Fort Pierre exploded around 10:20 a.m. Wednesday, Stanley County Sheriff Brad Rathbun said.
The sheriff said 6-month-old Harper Hupp and her grandmother, LaDonna Hupp, 61, died at the scene. William Hupp, 66, died at a…