The children are ages 12 to 5 years old. They were last seen at their mother and stepfather's home in Fresno on Saturday.
Investigators had suspected that their father -- Xa Yang -- picked them up and took them to Sacramento. Turns out, that's exactly what happened.
FBI agents working with Sacramento and Fresno police located the father and the children earlier Thursday afternoon.
Yang had not been in the children's life for years and just recently reappeared. It's not clear yet if Yang will face any charges in this case.