Do we know at this point how this happened?

Well, um, a preliminary investigation, and good morning from Athens, um, is underway.

So, uh, it's the official investigation.

Investigation is still in its early stages, so authorities have not reached any confident, let's say, conclusions.

Now, um, experienced firefighting pilots that have been speaking to Greek media, they say that, you know, based on the video footage and the evidence currently available, it's a combination of, uh, factors like human error, um, a- as lo- as well as the low visibility, the dense smoke, poor visibility, the strong winds, and the powerful thermal air cur- currents generated by the fire itself.

So we've seen the footage, uh, which is pretty dramatic.

Uh, the collision happened yesterday, Sunday afternoon, with the two Bell-type firefighting helicopters, uh, as they were carrying out water-dropping operations.

And what do we know about the crew members that died?