Gutierrez retired from the race after his left-front wheel detached from his car on Lap 42, as Kimi Raikkonen was about to lap him.

The stewards accepted that Gutierrez did not know about the problem, and therefore did not impose a penalty on the Mexican.

They said the retention devices operated within their required design limits and accepted a mechanical failure was the most likely cause for the problem.

Despite that, Haas was still deemed to have sent the car out in an unsafe condition and was fined for it.

The team was also asked to provide a report on the failure.

"Having reviewed the audio from the car, the available data and spoken to the driver and team concerned, the Stewards were satisfied that the driver Gutierrez did not know that he was driving the car in an unsafe condition," the stewards explained in a statement.

"It appears that a mechanical failure led to the wheel being able to be tightly fitted to the car while not actually attached correctly.

"An additional failure occurred in turn one under braking, but the wheel was still retained in an abnormal way until it appears that the failure of the rim blew the wheel past the retention devices.

"Having spoken with the Technical Delegate, the Stewards were satisfied that the retention devices operated within their required design limits. However, as some function of the design, part failure or fitting allowed the wheel to come loose on the track, which is considered a serious safety issue, the Stewards determined that this led to the car being released in an unsafe condition.

"In addition to the fine above, the Stewards order that the team provide the Technical Delegate with a report on the failure and all corrective actions."