Could it been shot down?

There have been some recent claims that the U.S. military could have accidently shot down the flight of MH370. So when the  airplane was considered "missing" U.S. could have assumed that the flight was hijacked at the first ad the consider the following; that there was military base on the Indian ocean and they might have been the target for the hijackers. The thing that just doesn't click is they say it is a "cover up" for the U.S. Military but there has been any type of  proof of any missile shot. Also, if the plane has been shot the high likely hood that the plane should have hit the water where the plane went off the radar. So how can this whole thing been shot and the military decide to fake the search and made this hoaxes? Also, the flight path of the plane had no sudden drops or any type of any struggle on the investigated flight path of the plane. Also, the U.S. military has been not been well know to jump to conclusion and shot down a plane without  any type of justification. Also in airspace traffic controls laws say you can't shot down a commercial aircraft without 100% certainty that the plane has been hijacked and is targeting a population of the land.

Mills, Daniel. "Was Flight MH370 Accidentally SHOT DOWN? Staggering New Claims That Doomed Plane Was Blown out of the Sky by US and Thai Fighter Jets in Training Drill Gone Wrong." Mail Online. Associated Newspapers, 19 May 2014. Web. 13 May 2016.
  This resource gave lots of imformation of how the fight could have bee shot down and how the military could have just cover up the whole thing. This was very creditably because this author wrote and was a former investigator