Professor Paul Mullen

And just what he did first, then we'll go back to why, he went out one day and he began shooting other people.

Military personnel kept on shooting until he himself was shot down.

He didn't actually die.

They kept him alive, and he went to trial, and at trial he said this was for jihad, that he was acting against America as part of jihad.

Okay, let's go back to this man's history.

So on the face of it, it was a terrorist attack.

He never took up the housing within the base, but lived in rather poor accommodation in nearby town.

He had nothing to do, really, with other doctors.

He did not join in any social activities with other military, nor did he join in any social activities outside.

Yeah, a very isolated man.

He did go to the mosque occasionally.

He wasn't a regular attender at the mosque for many years, but he would go to the mosque.

He felt he just couldn't face going to Afghanistan.

He blamed the army for not recognizing his gifts.

and he decided that he would strike back and become famous.

Now, it's a real mixture there.

Yes, on the first glance, it just looks like terrorism.

But then when you go into his psychology and you go into his personal history, he starts to look more and more like, say, the Port Arthur killer or the Dunblane killer or any of the other ones like that.

He was isolated, he was resentful, he believed he'd been mistreated, he believed that people didn't recognise how great he was.

He was almost certainly depressed, which is always a bit difficult.