The drama stepped up a notch even after the chequered flag in Barcelona.
A couple of hours after Williams’ first win since 2004, something exploded in the British team’s garage, triggering a major fire.
Team members and fire crews battled the blaze as paddock regulars scrambled away from the heavy smoke and police arrived on the scene.
The Telegraph’s Tom Cary said on Twitter there are "multiple injuries".
It is believed Williams, Force India and Caterham staff - some of whom bravely fought the fire - are being treated in the medical centre, some for smoke inhalation.
An emergency helicopter will ferry others to hospital.
"Couple of our guys got injuries, burns and maybe one broken wrist, no news on Williams guys I hope they’re ok," wrote Caterham’s Heikki Kovalainen on Twitter.
Rumours indicated the fire could have been caused by a KERS explosion, or possibly fuel, as a burned fuel rig was pulled from the gutted garage.