The National Highway Traffic Safety Administration (NHTSA) are investigating reports of gas pedals becoming trapped by floor mats in some 2010 Ford Fusions and Mercury Milans.

A Ford spokesman said the problem was due to drivers stacking all-weather mats on top of floor mats that come with the vehicle. Ford’s all-weather mats have warnings advising customers not to pile them and to secure them properly to the floor.

Safety officials said the investigation covers about 250,000 Fusions and Milans. The preliminary investigation is meant to try to verify whether the complaints have merit and gauge the seriousness of any potential problems. So far, there have been no reports of crashes or injuries related to this problem.