Fire officials are investigating a mobile home fire in Twentynine Palms Monday. Fire crews from Twentynine Palms, Joshua Tree, and the Combat Center were called to the 6600 block of Smoke Tree Avenue at 11:25 a.m. The fire, which is believed to have started in a bedroom, was under control in about 10 minutes. Firefighters were able to contain the blaze which was threatening another home.