[Lonesome in Massachussets]

I’m sorry sir but you’re a suicide bomber and you can’t get in to watch the football match. Be off with you now.

Apparently, when the security guard got to the "What's that thing?" stage, the terrorist retreated a few meters and blew himself up, a case of premature denotation.

[Sequoyah101]

I found this out in a better reported story on the event.

Premature detonation can happen to even the best of suicide bombers.