Local press are reporting gear collapse, sliding and hitting a 'structure' and bursting into flames, ended up right beside the control tower.
AvWeb reporting aircraft was taking off, became briefly airbourne - came back down hard - collapsing the gear . . .
Gulfstream 650 Down, Four Dead
Local News Coverage
N652GD Gulfstream G650 airframe number 2.
Gulfstream Press Release
photo Ned Harris/Flickr