No kidding. There's more to this than just these five buildings.
Yeah I think it's a cover to give them a reason to close off much of the access to the towns and landmarks, and bump up the presence of security without giving away what they really know about the real targets.
Tinfoil time..
Pentagon looks to directed energy weapons:
http://www.freerepublic.com/focus/f-news/1183043/posts