The Baja California Attorney General's office is assisting the San Diego County Sheriff in the effort to locate a missing Bonsall couple and their two young children.
The Baja California Attorney General's international liaison, Jesus Quinones, says investigators suspect the McStay family may have crossed to Mexico because their car was found abandoned in a San Ysidro parking lot.
Baja investigators are reviewing arrest records, looking in jails and working with Baja's department of family services to locate the children.
Baja California and San Diego Sheriff's representatives say they are looking into whether the family has ties to Tijuana, Mexico, or countries farther south.
Joseph McStay and his family have been missing since February 4, 2010.