More than 60 owners have complained of unintended acceleration in their Toyota Motor Corp. vehicles after dealer repairs under the automaker’s recalls, Bloomberg reported.

“We are determined to get to the bottom of this,” David Strickland, administrator of the National Highway Traffic Safety Administration, said in e-mailed statement yesterday. NHTSA had reported 10 such complaints a day earlier.

The agency questioned whether Toyota has fixed the defects that caused unintended acceleration. The Toyota City, Japan- based automaker, the world’s largest, has recalled about 8 million vehicles worldwide to reshape and replace gas pedals.

“If it appears that a remedy provided by Toyota is not addressing the problem it was intended to fix, NHTSA has the authority to order Toyota to provide a different solution,” the agency said in its e-mailed statement.

Toyota started interviewing vehicle owners soon after receiving the complaints on repaired cars from NHTSA, the carmaker said in an e-mailed statement.

“Although most of these reports have yet to be verified, Toyota has been and remains committed to investigating all reported incidents of sudden acceleration in its vehicles quickly,” the company said.

Lawmakers asked Toyota to provide more information about tests it commissioned on whether the defect stemmed from an electronics glitch. Toyota has said a study found that the electronic throttle-control systems performed as designed.