Amber Alert: 12-year-old missing from Reagan National Airport

Child was last seen at RONALD REAGAN NATIONAL AIRPORT, ARLINGTON , Virginia. Child was last seen wearing a white tee shirt shirt, blue jeans pants, black jacket.
Additional Significant Identifiers or Conditions of Child:
12 year old Individual was in America from China on a tour group. she received her passport just prior to checking in and left her group. she met up with an unknown middle age Asian female, who assisted her in changing clothes. they then walked together to the arrivals area of the airport and disappeared out of camera view.