(Portland, OR)  --  Search crews in Northern California are looking for three missing children of a former Portland-area family killed when their car plunged off a cliff and into the ocean.  Investigators have already found the bodies of 39-year-olds Jennifer and Sarah Hart and three of their six adopted children.  The accident happened Monday when their SUV went off the Pacific Coast Highway in a remote area of Mendocino County.  Among the missing children is 15-year-old Devonte Hart, who got national attention in 2014 when a picture went viral of him hugging a police officer during a police brutality protest in Oregon.  The family had recently moved from West Linn to Woodland, Washington.