SAN DIEGO -

The remains of two of four bodies buried in the desert near Victorville have been identified as missing husband and wife Joseph and Summer McStay but it remains unclear if the other bodies were that of their two young sons.

The McStays and their boys, Gianni and Joseph Jr., went missing from their home in Fallbrook in February 2010. The family's 1996 Isuzu Trooper was found abandoned four days later in San Ysidro, near the U.S.-Mexico border.

The skeletal remains of four people were found in and near two shallow graves, in the Mojave Desert outside Victorville by a motorcyclist on Monday, according to the San Bernardino Sheriff's Department.

Sheriff's officials said a forensic anthropologist would assist in conducting the autopsies to determine the causes of death, ages and gender.