Top Hamas leader Ismail Haniyeh was killed in Tehran by a covertly planted explosive device, according to Middle Eastern and American officials. The bomb, hidden in the guesthouse where Haniyeh was staying, was detonated remotely, killing him and a bodyguard. Iran and Hamas blamed Israel for the assassination, which threatened to escalate violence in the region. The attack exploited a security gap in the heavily guarded compound, leading to questions about Iran's intelligence and security. The precision of the attack was compared to Israel's previous assassination of Iran's top nuclear scientist. Israeli intelligence officials reportedly briefed Western governments on the operation, but Israel has not publicly acknowledged responsibility. The assassination occurred during heightened security due to Iran's presidential inauguration, raising speculation about the method of the attack. Israeli Mossad chief had previously stated the obligation to pursue Hamas leaders.