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Safety regulators are leaving no stone unturned at Tesla since the first known fatality involving the company's semi-autonomous driving system, Autopilot, was reported last week.

The National Highway Traffic Safety Administration (NHTSA) has opened an investigation involving a Tesla crash — the second in as many weeks. This most recent probe involves a Model X SUV that crashed in Pennsylvania on July 1, Automotive News reports.

The Model X reportedly hit a guardrail then swerved across a number of lanes. When it hit the median, it rolled over onto its roof. Both the driver and passenger were injured in the crash.

Specifically, regulators want to know if Autopilot was engaged during the Model X rollover, as it had been during the May 7 Model S crash that took the life of the driver.

According to the Automotive News report, the Model X sent reports to Tesla that its airbags had been deployed during the collision. However, it failed to send the Autopilot data logs.

"Based on the information we have now, we have no reason to believe that Autopilot had anything to do with this accident," Tesla said in a statement on the Model X crash in question.

NHTSA is currently gathering information from the driver, police and Tesla.

Clearly, this second investigation indicates the NHTSA is very wary of Tesla's Autopilot system — currently in customer-based beta testing — and is keen to know just how many roadway incidents it has been involved in.

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