A man watches the news on TV after Hamas political bureau chief Ismail Haniyeh was killed in an Israeli airstrike targeting his residence in the Iranian capital Tehran, Iran. Ismail Haniyeh, the political leader of Hamas, was killed in an airstrike in Tehran in the early hours of Wednesday morning, the group said, just hours after Israel claimed it had killed a top Hezbollah commander in Beirut. Hamas blamed Israel for Haniyeh’s death, which one official described as a “grave escalation”. The dual assassinations are heavy blows to Hamas and Hezbollah, but also raise the stakes for Iran, which backs both groups. Haniyeh’s killing was “a grave escalation that will not achieve its goals”, a Hamas official told Reuters.