A bizarre situation involving rental cars used during one of President Joe Biden’s trips has social media and conspiracy theorists busy with speculation.

The cars were owned by Hertz, and had just been returned by members of the Secret Service who had been using them during President Biden’s visit, sources said.

The Ford Expedition was under a battery recall by the manufacturer and had recently had the battery switched out. pic.twitter.com/CQzI5w0k2U

— Nantucket Current (@ACKCurrent) November 28, 2022

The day after President Joe Biden left Nantucket for his Thanksgiving holiday, five Hertz rental cars hired by his Secret Service detail burst into flames in the airport parking lot.

The Nantucket Current tweeted out photos and wrote, “The cars were owned by Hertz, and had just been returned by members of the Secret Service who had been using them during President Biden’s visit, sources said.”

A fire “involving multiple rental vehicles recently used by Secret Service agents erupted early Monday morning at Nantucket Memorial Airport,” reported the Current.

According to a statement from Nantucket Memorial Airport, at 5:22 a.m. on Monday, airport staff observed an active fire through the closed circuit TV system in the rental car overflow area. Local fire and police departments responded and contained the fire.

“Something very fishy going on,” one YouTube user commented on the Nantucket Current’s video. “No freakin’ way was this a coincidence. Absolutely no way,” wrote another.

An investigation is underway. The working theory is that the fire started in a Ford Expedition, which was under a safety recall since May due to a faulty battery junction box that has been known to cause underhood fires. The recall affects 66,000 Ford Expeditions and Lincoln Navigators manufactured between December 2020 and April 2021.

“We believe these vehicle fires can be traced to a circuit board supplier that changed manufacturing locations during the height of the Covid-19 pandemic,” according to Ford’s website. “The printed circuit boards produced there are sometimes susceptible to a high-current short.”

“Of the eight fire allegations, six occurred while the vehicle was parked and off, and two occurred while driving,” says the initial March 2022 report from the National Highway Traffic Safety Administration, the part of the Department of Transportation that investigates car safety issues. Interestingly, the eight vehicles were owned by multiple rental car companies at various locations.

By mid-May, the government had 16 reports of underhood fires in 2021 Expedition and Navigator vehicles. Of those, 14 were rental vehicles and 12 of the fires had occurred while the vehicle was parked with the engine off. Consequently, Ford has advised owners that these vehicles should be parked outdoors and away from buildings.

In an email to Forbes, Hertz confirmed that it was working with the local authorities on their investigation but did not confirm that the Explorer in question had been scheduled for service under the recall.