Perhaps they are just trying to downplay in order to catch some folks and to prevent panic which would disrupt their search.
Oh, of that I have no doubt.
I actually think it's a combination of two factors. One, being, this is saturday night. It's just reality they are never about on weekend at this time.
Second, they actually seem to be behaving responsibly by keeping some silence so people wouldn't stampede as well as allow investigators to attempt to pursue answers before full exposure descends.
But, my point is that I strongly doubt this blackout will continue indefinitely. IF we find this to be a terrorist connected to Islamofascists? it's what the MSM has been waiting for. Attempt to say the Iraq strategy has failed to keep them in the M.E. (this is what they said about the bombings in London) and once again go after Bush. The only part that wouldn't appeal to them is that 1) only the suicide bomber was killed 2) their 'friends' are further harmed by the exposure (Islamofascists)