Kimi Raikkonen has been reprimanded for his Monaco Grand Prix clash with Kevin Magnussen, while no action was taken over Jenson Button and Sergio Perez's collision.
The Formula 1 stewards investigated both incidents after the race but chose to limit the penalties to Raikkonen's reprimand.
The Ferrari man had been chasing Magnussen's McLaren for seventh place with six laps to go when they became entangled at Loews as the Finn tried to outbrake his rival.
Magnussen was adamant that the incident had been Raikkonen's fault.
"I closed the door at Loews and he chose to go anyway," said the rookie, who fell back to 10th with an engine issue.
Raikkonen had been running third until hit by Max Chilton's Marussia during the second safety car period. He had to pit for repairs and fell to 14th.
He admitted that after that delay he had been willing to make very aggressive moves.
"I tried to overtake on the inside kerb and couldn't make the corner," Raikkonen said of the Magnussen incident.
"He moved a little bit to the left and I went over the kerb and was pretty close to the turn, but the wall was too close and I had to reverse.
"I never hit him until I reversed, because obviously he was behind me.
"But I didn't really care at that point - a few points for eighth place, or 10th place or 11th place, it makes no difference for me."
PEREZ BLAMES BUTTON
Button and Perez's incident happened at Mirabeau on the opening lap and caused the first safety car, with the Force India stranded on track.
Although the stewards felt no action was necessary, Perez pointed the finger at Button.
"I was in a battle with Nico [Hulkenberg], who was ahead, and I went to take the apex normally," said the Mexican.
"I was on the racing line and ahead of Jenson when he clipped my rear wheel and spun me around into the barriers.
"I did not expect him to be there as there wasn't really any space for another car there."
Button declined to comment on the collision.