I guess anything is possible. Right now, the facts and logic point to a soldier going crazy (or being an Islamonut) and doing it. I guess we will know soon.
Right now, the facts and logic point to a soldier going crazy (or being an Islamonut) and doing it. What facts? This story has changed several times in the past 30 minutes.
If the guard is missing you have two theories. He did it or was taken out so the bad guys could get to his explosives.