The first practice of the Azerbaijan Grand Prix has been cancelled in farcical scenes in Baku.
A loose drain cover caused severe damage to George Russell's Williams, with the session cancelled after just 13 minutes.
The running was first red-flagged, before it was cancelled with he incident raising serious safety concerns ahead of Sunday's race.
F1 announced the first practice session would not resume so the track could be checked and oil could be cleared.
The second practice is scheduled to take place at 5pm local time (2pm UK) on Friday with qualifying on Saturday afternoon.
Lewis Hamilton fires warning to Ferrari over their treatment of Charles Leclerc
Russell, competing in just his fourth Grand Prix, sustained serious damage to his car after dislodging the drain cover at high speed.
"I got the biggest smack through my body, and the whole engine turned off," Russell told Sky Sports as he described the alarming incident.
"It's ruined the floor and I'm a bit worried for the chassis now. We were on the normal racing line and it's completely ruined our session. It's not what we need at this stage."
Lewis Hamilton 'only friends' with stunning Spanish model amid romance rumours
F1 world champion and current leader Lewis Hamilton took to Instagram to question the race organisers.
"How could they have not checked and sealed the drains. Oh well, just gives me extra time to catch up on game of thrones."
The recovery crane carrying the car back to the pits also collided with a temporary footbridge and then started leaking hydraulic fluid over the vehicle.
Deputy team principal Claire Williams said: "It's clearly not what we want and it's not what you expect from a Formula One track. These drain covers are supposed to be bolted down."
