A 15-year-old boy is being held in a Northern California juvenile detention facility and the search is on for a second alleged attacker after a violent home invasion robbery and sexual assault of an elderly woman in San Jose.

"Two suspects entered their home armed with weapons," said Officer Albert Morales with the San Jose Police Department.  "[The couple] were forced to the back of the house.  At some point the 85-year-old female was sexually assaulted."

Neighbors are still trying to understand how something so horrible could happen to the retired couple who's lived in the East San Jose home for more than 30 years.

"Right now I'm feeling so disgusted with the people that did this," said neighbor Angelica Grande.

Investigators say the suspects stole the couple's Chevy SUV and after being chased by the CHP on Highway 101, crashed the vehicle into a vacant home.

The 15-year-old boy was pinned in the passenger seat and was arrested.

The driver was able to run off.  Police describe him as Latino between the ages of 17 and 25, with a possible severe laceration.

Police say it appears to be a random attack.

The elderly woman was taken to the hospital and treated for her injuries.

Police are still seeing if they can gather enough information to create a sketch of the second suspect.