Federal safety regulators have begun looking into Tesla battery fires. The probe covers all Model S and Model X vehicles manufactured between 2012 and 2019 and sold in the United States.

The National Highway Traffic and Safety Administration is casting a wide net in its action, which NHTSA does not technically classify as an “investigation” but rather as a “defect petition.“ In a letter sent to Tesla’s legal department dated Oct. 24, the agency demands that Tesla produce all documents that relate to “high-voltage battery fires that are not related to collision or impact damage to the battery pack” in the Model S and Model X.