Sergio Perez has been judged responsible for his Canadian Grand Prix collision with Felipe Massa and will get a five-place grid drop for the next Formula 1 race in Austria.
Perez's Force India was running third at the start of the last lap when Williams driver Massa attempted to pass it into the first corner.
The front right wheel of the Williams made contact with the Force India's left rear, triggering a huge crash that almost collected Sebastian Vettel's Red Bull as well.
The Montreal F1 stewards ruled that Perez had caused the crash by changing his line approaching the corner.
"Car #11 changed his racing line which caused the impact with car #19 in Turn 1," said the stewards' statement.
Both Perez and Massa were taken to hospital for precautionary checks following the impact, but have been released unhurt.
Perez had run second, chasing Nico Rosberg's ailing Mercedes, for much of the race before beginning to lose ground with a brake issue.
Massa had led for a spell as he tried to make a one-stop strategy work, before pitting and falling to sixth.
He then made rapid progress to join the lead train before the clash with Perez.