This is what I know:
At about 10:10 CST there was an explosion that was heard in Norman. Channel 5, out of OKC, broke into the MNF game around 10:30 and reported that an explosion had happened in Choctaw. They followed-up after the game and reported the gunpowder smell and the elemtary school. There is nothing on either Channel 5's or 9's websites about the incident so I can't offer anything further. This is all I know.