A 34-year-old Oklahoma City man was arrested Monday night for making threats to Casper, Wyoming.
The FBI says several people called 911 Monday morning after spotting a post on an internet bulletin board from Glenn Kirkham.
The post said there would be an attack within 1-to-2 hours using small caliber handguns and other weapons.
Kirkham was arrested in Oklahoma City by 5:30 Monday night.
All of the schools were locked down in the entire county.
Agents say they want to remind everyone that this arrest is merely an accusation and the defendant is presumed innocent until proven guilty.