A neighbor reported the fire around 3 a.m. Friday.
Police tell KIFI-TV that two women and two children died in the house. A man was found alive but later died at Eastern Idaho Medical Center. The victims' names and causes of death have not been released.
Officials say the small fire started in the basement and only damaged the stairwell.
Ammon is a city of about 12,000 just east of Idaho Falls.
If you click on the KIFI link, the story is updated to say that the male found in the basement shot the other 4 before starting the fire then committing suicide. To kill the children was abominable not to mention the mother and her sister. For what?? God, why didn't he do that in reverse order?? There are so many selfish people out there in the world now....tis truly sad. God Bless them and their families, I know they're in so much grief right now...