Iran and Hamas confirmed Ismail Haniyeh was targeted and killed in a "raid" in a Tehran residence. Israel has not commented. How did it happen? Please suggest hypotheses in the comments.

I will consult reputable reporting and official sources when resolving the question. If Haniyeh is still alive, it will resolve to "Other"

EDIT: Options are mutually exclusive but the format doesn't reflect that, but I will resolve to only ONE answer.