U.S. auto safety regulators are investigating reports that the engines can catch fire on some Jeep SUVs and pickups even with the ignition turned off.

The probe covers more than 781,000 Jeep Wrangler and Gladiator vehicles from the 2021 through 2023 model years.

The National Highway Traffic Safety Administration says in documents posted Monday on its website that it has nine complaints of engine fires from owners, including one that caused an injury. A majority of the reports say fires began in the passenger side of the engine compartment.

The agency said it’s opening the investigation to determine the cause and scope of the problem. No recall has been issued yet. Jeep parent Stellantis said it is cooperating with the investigation. — Associated Press