Investigation in progress...isn't 'news.'
Come back when there's some actual proof.
Merely investigating a phenomena doesn't require that one believe it exists, but like UFO's, so long as there are cases for which the exact circumstance and cause hasn't been determined, there exists the possibility of previously unknown causes. The vast majority of these cases have either found a probable cause or lack sufficient data to determine a cause (or causes--never assume that there is only one causative factor in any even t!)
There are loads of documented events with unknown causes, in most cases there are quite strong indications that there may be a particular cause---but not proof. In most, proof is unlikely to ever be found given the lack of data on the events.
Remember that 'rogue' waves were 'tale tales' for millennial until we started spotting them from orbit.
The universe is far stranger than we can imagine.
As always, Occam's Razor applies.
