Multiple independent sources (WSJ and other web search results) confirm that Ruter, Oslo's transport authority, tested Yutong electric buses in an underground mine to check for vulnerabilities.

Multiple independent reports confirm that tests conducted by Ruter revealed that the Chinese manufacturer (Yutong) could remotely turn off or halt the buses.

Evidence confirms that the buses had cloud-based connectivity allowing the manufacturer direct digital access for software updates and diagnostics. The context of the tests being performed in mines to block signals (as mentioned in the evidence for claim 1) corroborates that the intent was to see if this access persisted or could be blocked, and the reports indicate the manufacturer maintained such access capabilities.