Mercedes GP boss Ross Brawn says his team will look into the pit stop problem that occurred during the Hungarian GP to make sure it does not happen again.
Nico Rosberg lost his right rear tire as he joined the pit lane following his pit stop. The tire then careered down the pit lane and knocked down a Williams mechanic, who escaped with no serious injuries.
Brawn said the team believed it understood what had gone wrong, but promised to look at the situation closely to avoid a repeat.
"It appears that as the guy came off with the wheel gun, it spat the wheel nut but he didn't see it disappear," said Brawn. "He went back on, fired the gun and realized the nut was no longer there so came back out to grab the other gun and the rear jack guy thought he had finished, so he dropped the car and away he went.
"I think we understand what happened and we will clearly look at how we can prevent it happening again."
He added: "When the gun went on to take the nut off, the gun hadn't engaged properly so the nut was off the axle and it spat it out. The guns are so quick and powerful now you don't see the nut traveling at the speed of light."