CALAVERAS COUNTY, CA- Sheriff's investigators in Calaveras County remain tight-lipped on the investigation into the death of 22-year-old twin brothers at their home in Valley Springs.

The sheriff's dispatch center received a 911 call at 4 p.m. Tuesday afternoon, shortly after a wide-ranging power outage hit the area.

Investigators said the twins, who suffer from a "long-term illness," were connected to breathing ventilators for life support. When deputies arrived at the home, they found the twins in "respiratory distress," Sgt. Chris Hewitt said. The deputies then initiated CPR.

Despite their efforts,the brothers were pronounced at the scene. Their names have not been released at this time.

Neighbors said they feared a back-up power system for the pair must have failed.

"They had backup systems that didn't work so it looks like there may have been a failure of equipment there," neighbor Steven St. Sure said."I mean power outages are always a possibility, especially up here."

Detectives said the twins' mother Julia Hall was at the scene and cooperated with the investigation. They"seized" the brothers' medical apparatus for examination, Hewitt said.

The cause of the death is to be determined during a post-mortem investigation.

"The circumstances behind the deaths of the two brothers are being investigated," Hewitt said.

Neighbors said they are grieved at the family's loss.

"I honestly don't know what to think about this because it's awful," neighbor Megan Dollens said. "I can't image what their parents are thinking."

No one appeared to be at the Hall family's home on Wednesday night.

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