POCATELLO, Idaho — Fire officials say 20 homes in the eastern Idaho city of Pocatello have burned and more are threatened in a fast-moving wildfire.

More than 1,000 people have been evacuated from some Pocatello neighborhoods and the community of Mink Creek. The Charlotte fire started Thursday afternoon, spreading quickly through bone-dry grass and brush.

Officials with the National Interagency Fire Center in Boise released a report Friday morning that said the fire was estimated at about 450 acres — that's less than one square mile. It's showing extreme behavior, spreading quickly and sparking off small new blazes some distance from the main body of flames.

No injuries have been reported. Fire crews are assisted eight engines and one helicopter, and they hope to have the blaze contained sometime Saturday.

Firefighters set up a command post at the LDS Church along Bannock Highway between the fire and I-15, and those who were evacuated were given shelter at Century High School. The American Red Cross set up an emergency shelter in the Idaho State University Holt Arena, according to a message on ISU's Web site.

"We are collaborating with the Red Cross and other emergency organizations to offer any and every kind of help we can to members of our community who have been displaced because of these tragic fires," said Arthur C. Vailas, Idaho State University President in the ISU Web page message. "Our hearts go out to all those who have been adversely affected by these fires, and we gladly offer our facilities and services to help them."

The fire is believed to be human-caused, and it remains under investigation.

Click the links to the upper right to see photos of the fire.