Two deadly crashes involving Tesla vehicles apparently operating in 'autopilot' mode draw scrutiny from federal regulators, AP NEWS reports..

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They point to a new potential danger: partially automated cars may not stop in front of motorcycles..

The US National Highway Traffic Safety Administration (NHTSA) sent investigation teams to two crashes last month in which Teslas collided with motorcycles on freeways in the dark.. Both accidents ended in death. The administration suspects that a partially automated driver assistance system was used in each case..

NHTSA says after gathering more information, it may include these crashes in a broader investigation into Tesla collisions with emergency vehicles parked along freeways.. In addition, the NHTSA is also investigating more than 750 complaints of Tesla slowing down for no reason..

Michael Brooks, acting executive director of the nonprofit Center for Auto Safety, called on the NHTSA to recall Tesla's "

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Since 2016, the NHTSA has sent teams to 39 accidents that allegedly involved automated driving systems, according to agency documents.. Tesla cars were involved in 30 of them, including crashes that killed 19 people.

Tesla, for its part, has stated that Autopilot and "

Tesla Autopilot keeps cars in their lane and behind other cars. The company also uses individual owners to test "

Tesla owner Elon Musk said at the company's annual shareholder meeting Thursday that the "