Red Bull Racing's Sebastian Vettel has confirmed that the team doesn't know yet precisely what forced him out of the European Grand Prix.

The German had been dominating the eighth round in the 2012 F1 World Championship and while he lost his hard fought lead when the safety car was deployed on lap 30, he maintained his position at the head of the pack on the re-start. However he was soon forced out, coasting to a stop through the DRS zone.

It was a bitter blow for the double F1 world champion and he now slips to fourth in the standings, 26 points behind Fernando Alonso.

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"To be honest we don't know yet [what the problem was]," he told BBC Sport. "Obviously I lost drive on the straight down to turn 17 and had to give way to the other people. The engine stalled, it switched off, and there was nothing we could do.

"At the moment it's not exactly clear what the problem was although it may be a similar issue to what happened with Mark on Friday."

"I think the Safety Car obviously was not ideal for us and it might be that the retirement is in some regards also down to the Safety Car. It is a shame," added the German.