Michael Schumacher has escaped any punishment for his incident with Fernando Alonso in Q2 at Austin.
The United States Grand Prix stewards spoke to both drivers after Schumacher appeared to impede Alonso during the second part of qualifying.
The near-miss prompted furious gestures and angry radio messages from Alonso.
But after looking into the incident, the officials decided no action was required as neither driver was on a flying lap at the time.
"Both drivers advised that they were on their first (preparation) lap of a multi-lap stint and were able to continue their respective laps," said a stewards' statement.
Schumacher produced his best qualifying performance since September's Italian GP as he took sixth in Q3. That will become fifth on the grid thanks to Romain Grosjean's penalty for a gearbox change.
Alonso could only manage ninth place in qualifying, though he will also benefit from Grosjean's demotion.
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