A 10 year old girl is missing from Rio Rancho, New Mexico, and now the FBI has joined the search for her. Have you seen Alexandra Greenwall?

courtesy: New Mexico State Police

Alexandra's mom says she and Alexandra had an argument on Wednesday of this week, and she believes that the little girl ran away sometime around 6:30 Thursday morning. She is believed to have taken off with two backpacks full of clothes. One of the backpacks was found near the family's home, but Alexandra has not been seen since she ran away.

New Mexico State Police issued an endangered missing person advisory, and the FBI is now also involved in the search. Authorities think she may be on the Rail Runner trying to get to Madrid, New Mexico, but it is possible that she is in the Rio Rancho area.

A house-to-house search has been done in Alexandra's neighborhood and the surrounding area, and her friends are also being contacted in the hopes of finding her. Authorities are worried about the cold temperatures at night, and are not letting up on the search. An AMBER Alert hasn't been issued because she ran away and was not abducted, and so far, there are no signs of foul play.

If you have any knowledge of Alexandra's whereabouts, please all Rio Rancho police at (505)-891-7226.