I am a season ticket holder for OU and was at the game. I can say that anything being brought into the game is checked at the gate ( I always bring binoculars, my wife her purse). i think he'd have a hard time getting in if the bomb was in a back pack. he may have realized this and decided to try plan B.
I can also tell you, I've been to mosque (long story) and it left me cold. One scrawny runt told me "We look on Jesus as a prophet and a very good man, but the gospels that say he was divine were written by Jews so we know they are lied." He said this as casusally as "The weather in Oklahoma is apt to change without a moments notice."
Thanks for your input. Can you get a photo of the mosque for us?