Kimi Raikkonen has hit out at Sergio Perez after his "stupid move" in Monaco cost the Lotus driver vital points in the Championship.
Perez proved to be one of the more daring drivers in Sunday's Monaco Grand Prix, overtaking several cars including Jenson Button and Fernando Alonso.
However, in his last move against Raikkonen he went too far.
Attempting to pass the Finn on the entry to the chicane, Perez instead hit him, costing both drivers dearly.
Raikkonen had to pit for repairs and dropped to 13th place while Perez retired a few laps later.
However, a brilliant final lap from the Lotus driver saw him recover to 10th, scoring one World Championship point. That, though, wasn't enough as his main rival Sebastian Vettel walked away with 18.
"It was a really disappointing day," said Raikkonen.
"Because of one stupid move from Sergio we've lost a lot of points to Sebastian in the Championship and you can't afford to lose ground like that.
"He hit me from behind and that's about all there is to it.
"If he thinks it's my fault that he came into the corner too fast then he obviously has no idea what he's talking about.
"It's not the first time he's hit someone in the race; he seems to expect people to be always looking at what he might do, then move over or go straight on if he comes into the corner too quick and isn't going to make it without running into someone.
"Not the ideal weekend but there's nothing we can do about it. At least we got one point back at the end."
Perez, however, believes Raikkonen was to blame for the accident.
"It was risky, but there was nothing I could to avoid the crash," said the McLaren driver.
"I overtook Fernando and Jenson in the same place, so at the end of the day you have to give some space.
"If you look at the accident I hit the wall on entry of the corner, so Kimi gave me no room at all and there was nothing I could do to avoid it.
"If someone could have avoided the accident then it was Kimi and not myself.
"At the end I was very unfortunate when I overheated the brakes, so that was main issue.
"I tried my best during what was a very difficult race. It's racing, sometimes things come off, sometimes they don't."