Williams' Carlos Sainz fastest on day two in Bahrain
Lewis Hamilton second, Ferrari team-mate Charles Leclerc third
Mercedes have completed the most laps so far with 306
Season-opening Australian Grand Prix 14-16 March
Max Verstappen aiming for fifth consecutive drivers' title in 2025
McLaren begin defence of constructors' championship
Get involved: #BBCF1
The three drivers that went back on track after the practice red flag, are now practicing a standing start.
Esteban Ocon, Oscar Piastri and George Russell have one more lap before their session ends.
Everyone else who stayed in their garages have finished for the early session.
Oscar Piastri (McLaren) - 44
Lewis Hamilton (Ferrari) - 45
Liam Lawson (Red Bull) - 28
George Russell (Mercedes) - 71
Fernando Alonso (Aston Martin) - 45
Pierre Gasly (Alpine) - 40
Esteban Ocon (Haas) - 69
Yuki Tsunoda (Racing Bulls) - 46
Carlos Sainz (Williams) - 44
Nico Hulkenberg (Sauber) - 56
All drivers are back into the pit lane, to practice a red flag.
Just like you would practice a fire drill at work, I suppose.
Chris Medland
F1 journalist in Bahrain
Never a good sign, with all eyes kept off the Red Bull while it undergoes some substantial work in the garage due to a loss of engine water pressure.
An empty pit wall tells you that it’s not going anywhere soon, with Liam Lawson not seen on track for about 45 minutes.
Lawson only has 28 laps to his name so far today, so not exactly the most productive morning session ahead of his first full season in F1.
There's a safety car, followed by a red flag. Don't worry though, it's just a practice.
The Ferrari engineers had covered Lewis Hamilton with a sheet of plastic, they've sprayed flow-vis paint on the car.
Meanwhile, the floor is off on the Red Bull car, looks like the team are getting to work before Liam Lawson returns for the second session.
The cameras have panned to the Red Bull garage, which has been blocked off. Are they done with the morning session already?
Liam Lawson is now the driver that has completed the fewest laps. He's been in the Red Bull garage for a while.
Mercedes' George Russell is back in the garage, he's completed 70 laps so far.
It looked like something was wrong with his right mirror.
Lewis Hamilton continues to be the fastest, George Russell is second with Carlos Sainz behind him.
The weather still looks gloomy as the drivers put in more laps before the session ends.
Image source, Getty ImagesEsteban Ocon is the next driver to do a race length. He's completed 59 laps so far with just 20 minutes left of the morning testing.
Fernando Alonso has been on a fast lap in his Aston Martin.
The two-time champion has put his car into the fifth spot.
Just 30 minutes of the morning session left.
Time for drivers to get in a few more laps before they had over the keys to their teammates.
Carlos Sainz and Liam Lawson are the only two on a full day of testing.
A new front wing for Oscar Piastri.
Esteban Ocon is back out on the track, his lap time keeps him at the 10th spot.
Oh no. There's a bit of contact between Nico Hulkenberg and Oscar Piastri. Their tyres touch as they turn a corner.
Nothing too drastic, they're both back into the garages.
George Russell has completed a race length now, the Mercedes man is up to 57 laps now.
He's joined by Yuki Tsunoda Nico Hulkenberg and Oscar Piastri on the track.
Oscar Piastri (McLaren) - 30
Lewis Hamilton (Ferrari) - 35
Liam Lawson (Red Bull) - 28
George Russell (Mercedes) - 57
Fernando Alonso (Aston Martin) - 34
Pierre Gasly (Alpine) - 31
Esteban Ocon (Haas) - 51
Yuki Tsunoda (Racing Bulls) - 34
Carlos Sainz (Williams) - 31
Nico Hulkenberg (Sauber) - 45
Lewis Hamilton has made a quick trip to the pits to change his tyres.
Yuki Tsunoda is back out on the track in the Racing Buls.
Chris Medland
F1 journalist in Bahrain
Image source, Getty ImagesLewis Hamilton’s 1:29.670 is already faster than anything seen at testing last year, although that’s always to be expected with a year of car development.
Watching trackside, it was clear he was pushing. He was one of a flurry of cars on quicker laps at similar times.
Turn 10 is a tight left-hander that features a tricky braking zone as cars are already turning left while braking. That means drivers often lock the left front tyre as it is unloaded (meaning the weight has shifted to the outside tyres), but Hamilton had no such issues, and got the power down smoothly to accelerate out of the corner, too.
The same can be said for the Williams, as Carlos Sainz looked nice and controlled through that section on his lap at the same time - even though he was on a harder tyre compound - while George Russell spun the rear wheels a little bit as he was slightly too aggressive getting back on the throttle in his Mercedes.
The Bahrain Grand Prix is 57 laps. Will we see drivers complete a full race lap before the morning session is over?