(June 1, 2010) DETROIT — Ford's Fusion and Mercury Milan cars are under investigation by U.S. regulators because floor mats may trap the accelerator pedals, the National Highway Traffic Safety Administration said.

About 249,300 cars from the 2010 model year may be affected, NHTSA said today on its Web site.

The agency said it received three complaints about accelerator pedals being trapped by unsecured all-weather floor mats. No crashes or injuries have been reported.

Toyota Motor Corp., the world’s largest automaker, has recalled about 5.4 million vehicles in the past year for floor mats that the company said may entrap gas pedals and cause unintended acceleration.

“We do not recommend stacking floor mats in any vehicle by any automaker,” said Ford spokesman Said Deep. “We’re not aware of any customer complaints or accidents with properly installed floor mats. We’re going to cooperate fully with NHTSA.”

The Fusion is Ford’s best-selling car, accounting for 38 percent of the company’s U.S. sales of cars through April.