Hamas political leader Ismail Haniyeh was assassinated in Tehran on Wednesday using an explosive device that had been covertly hidden in the guest house where he was staying, a source familiar with the matter told CNN. According to the source, who had been briefed on the operation, the bomb was concealed about two months ago in the guest house where Haniyeh was known to stay in Tehran and detonated remotely once he was inside his room there. The Iranian government and Hamas say Israel carried...