"The coastguard said on its website the cause of the fire was unknown, but a coastguard spokesperson had earlier told Reuters it began near an electric car. Roughly 25 out of 2,857 vehicles on the ship were electric."

https://www.reuters.com/world/europe/one-dead-cargo-ship-fire-electric-car-suspected-source-dutch-coastguard-2023-07-26/

Ship carrying nearly 3,000 cars ablaze off Dutch coast, crew member dead

A fire blazed on a cargo ship off the Dutch coast with nearly 3,000 vehicles on board on Wednesday, killing one member of the crew and injuring several others, the coastguard said.

I'll be looking for some kind of official accident report for the resolution.