U.S. auto safety investigators are intensifying their probe into Tesla's Autopilot system following a recall of over 2 million vehicles in December, due to ongoing issues with 20 post-recall crashes. The National Highway Traffic Safety Administration (NHTSA) is seeking detailed information from Tesla on how the Autopilot was developed and verified. Tesla faces a deadline of July 1 to provide this information or risk fines up to $135 million. Additionally, U.S. prosecutors are investigating whether Tesla committed securities or wire fraud by misleading investors and consumers about the capabilities of its self-driving technology.