Sergio Perez admits he was 'scared' when his Force India was pitched into a roll following his crash during the first free practice session for the Hungarian Grand Prix.

An issue with the right rear suspension at the fast turn 11 right-hander would send Perez into the opposing barrier, damaging a wheel that would tuck under the chassis and flip it over.

Landing upside down, Perez was able to extricate himself from the car, but while he was unhurt he admits the accident caught him by surprise.

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"It was quite a dramatic accident, losing the car at that kind of speed," he said. "The impact was not that bad, but when I rolled over I was a bit scared. Getting out of the car was quite a challenge, but thanks to God nothing happened. I am here and looking forward to tomorrow."

With Force India investigating the exact cause of the crash, both Perez and Nico Hulkenberg were withdrawn from FP2 as a precaution, a move the Mexican driver supported.

"We are still trying to find out, but we can see the rear suspension bent out. We are still analysing to make sure we can run for the next day. It was a very strange accident. I was on the Astroturf and suddenly I lost the car. The Astroturf was very dirty at the time but looking at the video I can see the rear suspension just breaks.

"I think we made the right decision not to run with Nico until we solve the issue."