South Korea:
Presidential candidate halts campaign after staffers die inside election bus
Police suspect a campaign chief and a driver have died from carbon monoxide poisoning
…"Police suspect the victims have been poisoned by carbon monoxide emitted by a generator powering an LED screen.
“There is an LED electronic signboard outside of the election campaign bus to show promotional videos. We were told to open windows while using the sign board because the generator can cause carbon monoxide poisoning,” Choi Jin-seok, Ahn’s campaign chief, told reporters on Tuesday.
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“But it seems like the two vehicles did not open the windows, perhaps because of the cold weather.”
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https://www.rt.com/news/549642-south0-korea-camapaign-incident/