Briana Nikki Conklin was three years old when she and her five-year-old brother, Sebastian Lucas Conklin, disappeared from Hallandale Beach, Florida, on December 3, 2011. Both children are biracial, of Hispanic and White descent; Briana was described as a biracial female with brown hair, brown eyes, pierced ears, about 3 feet tall and roughly 35 pounds.

Authorities treat the case as a parental abduction. Fairfax County Police in Virginia are handling the investigation and say the children’s non-custodial mother, Marcela Conklin, is the suspect. A felony kidnapping warrant for Marcela was issued on December 5, 2011. Marcela was described as a 30-year-old Hispanic female, brown hair and brown eyes, about 5 feet 3 inches and 125 pounds. Investigators suspect the children may have been taken to Cochabamba in central Bolivia, but the children’s whereabouts remain unknown.

If anyone recognizes Briana or Sebastian or has information about Marcela Conklin’s whereabouts, please contact the Fairfax County Police Department.