During the morning session of Testing Day 4 in Barcelona it was Sebastian Vettel who caused a red flag.
The Ferrari driver went wide and through the gravel at turn 8 and lost control of his car when rejoining the track.
🚩 RED FLAG 🚩
Seb slides through the gravel at Turn 8 😨
He returns to the pits, but there's gravel to be cleared#F1 #F1Testing pic.twitter.com/RmIeDZ47Wp
— Formula 1 (@F1) February 26, 2020