Fire Marshal investigators say a fire that started in the master bedroom quickly spread in a house in the 200 block of West Eighth Street killed Tah Robinson, 4, and Micah Johnnie, 2.
They say it likely started with a ceiling fan and/or a discarded cigarette shortly after 3 a.m.
Four other people escaped the burning building before firefighters arrived.
The other blaze, in the 600 block of Jacobs Ave,, destroyed the house in which it started as well as a neighboring one and damaged some mobile homes nearby.
The structures were either vacant or no one was at home when the fire started.