Formula One's governing body will investigate procedures after cars were allowed on track before a recovery crane had returned to safety during Turkish Grand Prix qualifying, race director Michael Masi said on Saturday.
The crane had been deployed at turn eight after Nicholas Latifi's Williams was bogged down in the gravel trap at the end of a rain-hit and delayed opening phase with cars sliding on a slippery surface.
The second phase then started with the crane not yet behind the safety barriers, with double yellow flags waved to warn drivers of the danger.
"The crane was still out when we were driving around," said Red Bull's Alexander Albon.