Sebastien Buemi will take a five place grid penalty in the Hungarian Grand Prix after stewards at the Nurburgring found him at fault for the incident that forced Nick Heidfeld to retire.

Heidfeld was attempting to make up places after a clash with Paul di Resta on the opening lap when he came up behind the Toro Rosso driver on the run to the final chicane on lap ten.

As Buemi moved across in front of him, Heidfeld was forced onto the grass with his car briefly getting air before coming to rest off the circuit in the gravel.

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Having been at fault for the incident with di Resta earlier in the race, Heidfeld insisted there was nothing he could do about the coming together with Buemi and laid the blame firmly with his rival.

"I was squeezed at the start and sandwiched in the second corner," the Renault driver said. "Heading into the third corner Paul di Resta was on the outside. I locked up my front wheels and tried to avoid him but just slid into him as there was nowhere to go. After that I was trying very hard to make up positions and I overtook some cars before I was behind Sebastien Buemi.

"He blocked the left hand side, as he is allowed to do, but when I went to his right hand side he just moved over on me. He must have known I was there. I had a lot more speed than him and was on my way to pass. He just didn't give me any room and pushed me on to the grass and after that there was nothing I could do. It was an accident which couldn't be avoided. It's never nice being up in the air in one of these cars and it could have been dangerous."

Buemi, who picked up a puncture in the incident, eventually took the chequered flag down in 15th position with a gamble on a wet-weather set-up having also worked against him.

Following the race, Buemi was deemed to be at fault for the collision with Heidfeld and the grid penalty in Hungary will follow his demotion to the rear of the field for the German race for a fuel irregularity following qualifying.

"I had quite a good start, passing several cars," he said. "Unfortunately after that, Heidfeld drove into me at the chicane and I got a puncture on my right rear. So I had to pit and change tyres, which compromised our strategy even more and with no rain, that was really it.

"It has been a disappointing weekend in which we cannot be satisfied with our performance, therefore all we can do is look ahead to the Hungarian Grand Prix and at least we don't have long to wait for that."