I agree that it was most likely from a sub or large ship. Probably a test fire of a missile that went wrong and instead of heading out over the ocean it went toward land. If the government admits to the error they would get in trouble for the error and putting lives at stake but they cannot blame an non Government agency because that means that homeland security should have picked up on it. Since they are stuck in the middle they chose to go with the old "ummm...I dunno" response. I find it hard to believe that they do not know the source or even where the missile ended up. Something that large doesn't go flying into the sky and just disappear, it had to have been tracked by someone.