Federal safety regulators investigating the crash of a Toyota Prius in suburban New York said Thursday that the car’s computer showed no evidence of braking by the driver at the time of the crash.

The driver told police she had been unable to stop the car from speeding and crashing into a stone wall.

The computer indicated that the car’s throttle was “fully open,” according to a statement from the National Highway Traffic Safety Administration, which sent investigators to examine the car along with Toyota engineers.

The finding raises the possibility that the car, a 2005 Prius, accelerated because the driver, a 56-year-old housekeeper whose name has not been released, mistakenly pressed the accelerator instead of the brake. The driver was leaving her employer’s driveway in Harrison, N.Y., when the car sped up, crossed a street and hit a wall.