Yehya al-Sinwar, the head of Hamas in the Gaza Strip, has been chosen to replace the late Ismail Haniyeh as the top leader of the Palestinian militant group. His promotion within Iran-backed Hamas was announced on Tuesday on Telegram, and comes as the Middle East braces for a possible new wave of attacks by Tehran and its allies against Israel. Al-Sinwar is accused of being a mastermind of the October 7 massacres in southern Israel that killed some 1,200 people, mostly civilians, and took around 250 people hostage. But despite Israel’s nearly 10-month air and ground offensive in Gaza, al-Sinwa…