United States Senators Ed Markey and Richard Blumenthal have written to the National Highway Traffic Safety Administration (NHTSA) to ask if carmakers have reported the cybersecurity vulnerabilities in their Internet-connected cars and what steps NHTSA is taking to address the problem.

The senators called for the answers from the America’s top car safety regulator in response to Consumer Watchdog’s recent report, “Kill Switch: How Connected Cars Can Be Killing Machines and How to Turn Them Off.” The report, prepared with the help of car industry technologists, found that all the top 2020 cars have Internet connections to safety critical systems that leave them vulnerable to fleet wide hacks.