The National Highway Traffic Safety Administration said on Friday it has opened an investigation into 2.4 million Tesla vehicles after one of them with Full Self-Driving (FSD) technology fatally struck a pedestrian.

The U.S. auto safety regulator's Office of Defects Investigation (ODI) has identified four reports in which a Tesla vehicle experienced a crash after entering an area of reduced roadway visibility conditions with FSD engaged.

The preliminary evaluation will assess FSD's ability to detect and respond appropriately to reduced visibility conditions, among other issues, ODI said.

(Reporting by Akash Sriram in Bengaluru; Editing by Shilpi Majumdar)