Sky Sports F1 wrote:Seven F1 staff members remained in Barcelona hospitals overnight following the fire which broke out in the Williams garage in the wake of their victory in the Spanish GP.
An electrical fault with the fuel rig is believed to be the cause of a fire that rapidly engulfed the garage and enveloped the pitlane in a thick black cloud of smoke.
In a statement released late on Sunday night, the Williams team reported:
"After today's Spanish Grand Prix a fire occurred in the team's garage which originated from the fuel area.
"Four team personnel were injured in the incident and subsequently taken to the medical centre.
"Three are now receiving treatment at local hospitals for their injuries, while the fourth has been released.
"The team will monitor their condition and ensure they receive the best possible care.
"The team, the fire services and the police are working together to determine the root cause of the fire.
"The Williams F1 Team would like to thank all of the teams and the FIA for their support in today's incident."
In a statement of their own, the FIA, F1's governing body confirmed that 31 team members were seen by circuit medical centre staff, the majority for smoke inhalation, and 24 released.
The remaining seven have been transferred to local hospitals where they continue to receive treatment.