Renault's Kevin Magnussen has heaped criticism on Toro Rosso's Daniil Kvyat after the pair collided during the Monaco Grand Prix.
Kvyat was running a lap down when he collided with Magnussen at Rascasse, sending the Renault driver into a spin.
Magnussen suffered a secondary off when he later hit the wall at Mirabeau Haute and ultimately retired from the race.
"We were in a good position as a lot of people were still to pit and we gained a lot of places," he said.
"Unfortunately, Kvyat just lost his mind and crashed into me and that was effectively the end of my race.
"We did continue and made an early change to slicks as we had nothing to lose, but ultimately I hit the wall and damaged the front wing.
"We were several laps down at that point and the car had been in the wars so it was safer to retire."
Team-mate Jolyon Palmer crashed out under wet conditions along the pit straight.
"The traction was appalling after the Safety Car and I got caught out," he said.
"I had wheelspin in fifth gear on the white line that crosses the track. There was nothing I could do – I was just a passenger and went straight away into the wall."