Ells said a municipal police officer in Mexicali found the boy walking the streets by himself late Thursday. The officer initially thought the child was from the neighborhood and took him to several houses seeking his family before leaving him in child protective custody, Ells said.
Mexican authorities did not realize who the child was and didn't issue an Amber alert until Friday afternoon, he said.
Ells said Briant's mother, Maria Rosalina Millan, and investigators boarded a plane to Calexico Friday night. An FBI agent crossed the border and handled immigration paperwork for the boy, who holds dual U.S. and Mexican citizenship, he said.
The FBI agent brought Briant back across the border for the reunion Saturday, Ells said.
Ells had no details about the child's condition or how long he had been left alone.
Investigators were continuing to investigate why Briant was abducted and why his family was targeted. Millan said two men burst into her home on May 3, tied up the family, stole money and other property then left with her youngest child.
The kidnappers had not demanded a ransom and the initial investigation pointed to the kidnappers being strangers to the family.
Federal and local investigators were looking at several theories, including that the Spanish-speaking kidnappers were from Mexico and may have had ties to organized crime there.
Authorities later released a photo of two men they said were the kidnappers. The blurred image was taken from a surveillance camera in a home-improvement store as the men bought tape believed to have been used to bind Millan and her children.
The family lives in a modest, single-story home in a lower-income area abutting the city of San Bernardino, about 60 miles east of Los Angeles.
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Associated Press writers Daisy Nguyen in Los Angeles and Mariana Martinez and Alexandra Olson in Mexico City contributed to this report.
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