UPDATE 2: "Unfortunately it looks like they [Marquez and Pedrosa] slightly touched each other and the rear wheel speed sensor [on Pedrosa's bike] was broken.

"After that there was no more traction control, which is why Dani crashed" - Livio Suppo, Repsol Honda team manager to Dorna TV.

Suppo was seen having a lengthy conversation with race winner Marc Marquez in parc ferme, presumably explaining what had happened.

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"I touched Pedrosa a little bit and I saw that he crashed," Marquez confirmed.

UPDATE 1: Dani Pedrosa 'cleared of serious injury'.

Jorge Lorenzo has been handed an early two-second lead in today's Aragon MotoGP race after drama for Honda team-mates and title rivals Dani Pedrosa and Marc Marquez.

The trio - Lorenzo, Pedrosa and Marquez - were running nose-to-tail on lap 6 of 23 when Marquez swerved to avoid second-place Pedrosa's rear wheel under braking for Turn 12, running wide before rejoining the circuit.

Moments later, Pedrosa highsided on the exit of the same left-hander.

It is not clear if there was light contact between the team-mates but the fall may well have cost Pedrosa, celebrating his 28th birthday today, any chance of the 2013 title.

Rookie Marquez held a 34-point lead over both Lorenzo and Pedrosa heading into the race.

Pedrosa, who broke his collarbone earlier this year, is being checked in the Medical Centre for a 'suspected left knee injury'.

Marquez caught and passed Lorenzo to win the race, building his title lead to 39 points. Pedrosa is now 59 points adrift with only 100 still available.