A fatal crash in which a Tesla plowed through a brick home in Katy, Texas, killing a 76-year-old woman, set off alarms about the company’s driver-assistance technology.

Tesla's ( TSLA) latest federal safety probe isn't a routine crash investigation.

Elon Musk commented on the allegations on X, writing, “Yes, this makes no sense. FSD [Full Self-Driving] drives slowly through neighborhood streets and this was a high speed crash!”