As Fly Stimulator says.
This is an awful accident which has affected a great many people. The investigation is just starting, as is the painful process by which the bereaved must adjust their lives; unsurprisingly the police have not yet released the names - it's right that family are notified personally first.
We all have the deepest sympathies for the friends, colleagues and families of those who died. Whilst doing this, lets let those closest to them support them, and try to stay out of the way whilst the investigators do their job to try and find the cause, and prevent any recurrence of whatever happened here.
G