Federal regulators said Wednesday that they had received 10 reports of Toyota vehicles accelerating unexpectedly after they were repaired at dealerships.

The complaints have not been verified, but they add to questions about whether Toyota’s big recalls will resolve its problems with unexpected acceleration. The National Highway Traffic Safety Administration said it had begun to contact and interview the consumers who filed the reports.

“If Toyota owners are still experiencing sudden acceleration incidents after taking their cars to the dealership, we want to know about it,” the agency’s administrator, David Strickland, said in a statement.

Toyota said its United States dealerships had repaired more than a million vehicles since early February out of six million vehicles that have been recalled to fix problems with the accelerator pedal. More than two million vehicles in other countries have also been recalled.