Maybe it's my doubting, cynical nature, but it's less credible for Egyptians than for the arrest of the woman who raised a ruckus on a flight from England to the US.
I guess it's any unequivocal, "There's no terrorism involved," as opposed to, "At this time, we do not suspect any terrorism."
Any time Gobbermint sez something as a categorical statement, I tend to assume the opposite.
My batting average, there, would be the envy of any who've ever played baseball--by better than double.
Art