Police on Tuesday referred to prosecutors the case of an 88-year-old former senior bureaucrat who was involved in a Tokyo car crash that left a toddler and her mother dead and prompted many elderly Japanese to surrender their driver's licenses for fear of causing a similar accident.

The police concluded after a seven-month investigation that the April accident was caused by Kozo Iizuka, former head of the Agency of Industrial Science and Technology, rather than a problem with his car.

The police did not disclose whether Iizuka admitted to the charge of negligence resulting in death. He has said he may have mistaken the gas pedal for the brake, according to investigative sources.