The United States road safety regulator opened a special investigation after a Tesla Model 3 crashed into a house in Texas and killed a 76-year-old woman. The fatal incident occurred on June 19 near Houston, and the National Highway Traffic Safety Administration (NHTSA) said it had opened an investigation. The Harris County Sheriff's Office, Texas, said the driver admitted to using the Model 3's automatic driving assistance system when the car went off the road and hit a house. Police said the driver showed no signs of being drunk and cooperated with investigators. Tesla did not immediately respond to a request for comment. Tesla CEO Elon Musk denied reports that the car was in automatic driving assistance mode, writing on X that "FSD is slow on neighborhood roads and this is a high-speed accident." Tesla's AI vice president, Ashok Elluswamy, also denied the technology was to blame, stating the driver took manual control by pressing the gas pedal and that the car reached a speed of 73 miles per hour during the accident.