Early Thursday morning, Mesa police responded to calls of possible shots fired in east Mesa, and what happened next put one of their own in the hospital. As an officer sat in his patrol car with the emergency lights on, video shows a person throwing an object with what appeared to be a lit fuse toward the vehicle. Police describe it as an "undetermined explosive device," and it blew up right next to the car with the officer inside. He was hospitalized with non-life-threatening injuries and has since been released.

Police arrested Christopher Byasse, 57, and Christopher Jones, 55, for the alleged attack. Byasse is charged with aggravated assault against law enforcement, arson and misconduct involving a weapon, and police say he was already prohibited from having weapons. Jones is charged with one count of arson and one count of criminal damage. These are allegations, and neither man has been convicted of anything. Bomb squad detectives have confirmed that an improvised explosive device went off, but questions remain about exactly what it was and what was behind the alleged attack.