A Navy spokesperson told KFMB it wasn't their missile. He said there was no Navy activity reported in the area Monday evening.
OK, here's a clue. Admitting you are firing a "test shot" costs nothing, reveals nothing. If it was ours we would have said so. Even if it was new technology (which doesn't seem likely from the evidence at hand) admitting it costs less than not admitting it and ascribing it to existing technology. "Mystery rockets" cause more trouble than unannounced tests. This, if the Navy didn't admit it, then either some PIO is going to get his tail chewed for handing out false information or the Chinese Navy just sent us a message.