Ismail Haniyeh, a senior Hamas leader, was assassinated on Wednesday at a guesthouse in Tehran, according to multiple Middle Eastern and American officials. The attack, which killed Haniyeh and a bodyguard, was carried out using an explosive device that had been secretly planted in the guesthouse two months earlier, according to multiple reports. The guest house, part of the Neshat compound in an upscale northern Tehran neighborhood, is operated and secured by the Islamic Revolutionary Guards Corps (IRGC). The bomb was remotely detonated after confirming Haniyeh’s presence in his room.…