Vettel was working his 41st lap of the morning session when his Ferrari SF90 went off-track and hard into the barriers at turn three, triggering the car's g-force sensors and requiring Vettel to take a trip to the medical center to be checked out by doctors. Gasly lost control of the RB15 as he entered the corner, spun through the gravel and made heavy contact with the barriers.
However, with Leclerc having been only able to put in an installation lap in the final minutes of Wednesday's running, the Monegasque will get a proper run this time around. The auto returned to the track at the end of yesterday's test and covered 56 laps on Thursday morning.
However, comparisons between the top three teams on single lap pace remain tricky, as Mercedes opted not to focus on performance on the softest compounds, setting its fastest time on the C2s, while Pierre Gasly's C5 time seems anomalously slow compared to other times set by the Red Bull this week.
"It hasn't changed since day one, to be honest".
Red Bull driver Max Verstappen, sixth fastest, prompted one of the red flags of the days as he stopped with a problem at the end of pit lane, while Sainz prompted another with an issue that halted him at the main straight.
Stacey Solomon reveals fears for children over horrifying Momo Challenge
But, over time, the missions become more unsafe and drastic, and the viewers are told to commit self-harm or even suicide. Momo begins with a shadowy controller sending violent images to the victim's mobile phone via the popular messaging app.
Alonso, who quit the team and sport at the end of past year but is now a test driver and ambassador, said he did not want to test in Barcelona because early mileage for Carlos Sainz and Lando Norris is "precious".
Ferrari's Sebastian Vettel had a day to forget in Barcelona after damaging his vehicle during pre-season testing.
But team boss Zak Brown has agreed to let Alonso drive the 2019 auto later this year.
Renault said Russian driver Sergey Sirotkin, who raced for Williams last season, will be the team's reserve driver in 2019.
Leclerc's time, set in the morning, is just 0.058s adrift of Lewis Hamilton's pole position time for last year's Spanish Grand Prix.
The opening round of the 2019 world championship is scheduled to start in Melbourne on March 17.