I just posted several that say it...some of the earlier ones did say 7:20 and the Ok. Daily still says "about 7:30" in at least a few.
The use of the word 'explosion' in searches for articles is turning up many of the earlier articles, at least, instead of searches using variations of bomb/bomber/bombing, etc.
Just if anyone's looking. Anyway, although I didn't see where the question about 7:20 arose, I found the articles in under five minutes on both google and alexa using that time...not saying that means 7:20 or any other time mentioned so far is necessarily right, given how little they're telling us...it's just another of the many variations.
PhiKapMom, you were there, so I'm sure your time is accurate...just trying to fill in the holes for this question that apparently came up along the way!
Hope that helps if anyone's looking for other older ones (explosion vs. bombing, I mean)!