BILLINGS (AP) -- Federal investigators used a helicopter to search the area where a missing Crow Agency family's vehicle was found, but found no clues to help them locate the Little Light family.

Teddy Little Light, his wife, Juliet Toineeta Little Light and their 3-month-old son Wyatt have not been seen since Dec. 23, when they stopped at Little Light's mother's house to drop off Christmas gifts.

The family was reported missing on Jan. 3 when Juliet failed to attend her grandmother's funeral.

Matthew Pryor, the special agent in charge of the Bureau of Indian Affairs' Office of Justice Services, said Friday's aerial search did not turn up any clues.

"I'm glad we didn't find anything, but that doesn't close the case or help the family," he said. "The investigation will continue until we can reunite the family."

Little Light's pickup was found Monday near Fort Smith. It has been impounded, Pryor said.

BIA and Big Horn County law enforcement searched the area on foot and all-terrain vehicles earlier in the week and found nothing, said Undersheriff Rondell Davis. Officials hoped they would be able to spot something from the air Friday after snow melted during Thursday's warm weather.

The family is listed on state and national databases for missing persons.