Schumacher said he was not concentrating properly in difficult, wet and treacherous conditions and lost control of his Mercedes car when it ran over a white line on the circuit.
It was a major shock for the crowd in the stadium section of the Hockenheim circuit with four minutes remaining in a session topped by Venezuelan Pastor Maldonado. His car suffered heavy damage to all four corners and the practice session was red-flagged and halted.
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