Palestinian militant group Hamas on Friday confirmed its leader Yahya Sinwar had been killed by the Israeli military in Gaza, a day after Israel announced his death. “We mourn the great leader, the martyred brother, Yahya Sinwar, Abu Ibrahim,” Qatar-based Hamas official Khalil al-Hayya said in a recorded video statement.Israeli security officials believe that Mohammad Sinwar, the younger brother of the slain chief Sinwar, will be appointed as the new Hamas leader, while Khalil al-Hayya, Yahya’s deputy, will assume political responsibilities.