Search crews combed parts of Santa Clara County on Saturday as authorities continue to look for a missing Gilroy woman police believe may have been killed by her son.
The San Francisco Chronicle reported that teams of about 30 deputies and about a dozen dogs searched for Martha Gutierrez in a rural area of the county.
Gilroy Police Sgt. Joseph Deras says nearly 70 friends and neighbors also looked for Gutierrez.
Police despite the combined efforts, there were no signs of the missing 52-year-old woman.
Martha Gutierrez has not been seen since Tuesday, a day before authorities found the bodies of her son, Abel Gutierrez and her 11-year-old daughter, Lucero Gutierrez, in the family's Gilroy apartment.
Police say 27-year-old Abel Gutierrez, an Iraq veteran believed to be suffering from post-traumatic stress disorder, shot his sister and then himself.
Officers believe his mother is either dead or gravely injured.