Twin brothers, both living on ventilators to breathe, died during a power outage in the Valley Springs area. Neighbor Stephen St. Sure witnessed the efforts to save the boys,

"I saw all these cars parked down there, then we started seeing more and more and ambulances coming in and stuff like that," St. Sure told News10.

Paramedics were unable to save the two. 

The boys, in their early 20's, suffered from muscular dystrophy. T he home did have a back-up system but it apparently failed.

The Calveras County Sheriff's office is investigating.