March 19 (Reuters) - The U.S. National Highway Traffic

Safety Administration has intensified its probe into millions of

Tesla vehicles, upgrading it to a more detailed engineering

analysis of the company's driver assistance system, the auto

safety regulator said on Thursday.

The probe covers roughly 3.2 million vehicles, across

multiple models the company has sold.

The move marks a significant escalation that could lead to a

recall or other enforcement action if regulators find a safety

defect.

Tesla did not immediately respond to a Reuters request for

comment.