End of Life cars. So most likely EVs with old lithium ion batteries. They just recently switched to LFP 5 years ago but are still use Lithium Ion as well.
If you notice. Almost all portable power stations switched to LFP. But Ebikes and Escooters still use Lithium ion and those are catching fire like crazy. Everyday one is catching on fire. Fire experts ‘kept awake’ over growing hazard of lithium-ion batteries | Lithium-ion batteries | The Guardian