Toyota Motor Corporation is expected to announce preliminary findings of its investigation today into the sudden, high-speed acceleration of a Toyota Prius last week in San Diego, California.

Prius owner James Sikes called 911 last week to report losing control of his Prius hybrid at 94 miles per hour on San Diego's Interstate 8, according to The Associated Press. A California highway patrol officer helped bring the vehicle to a stop.

The National Highway Traffic Safety Administration is reviewing the incident but said today it could not explain how the sudden acceleration occurred. It is investigating claims from more than 60 Toyota owners that their vehicles continue to accelerate unexpectedly despite having their vehicles repaired.

Toyota will announce its own findings today at a press conference in San Diego.