Israeli forces have killed Hezbollah leader Hassan Nasrallah in an airstrike on the group's underground headquarters in Beirut. The attack also killed other Hezbollah commanders, including Ali Karaki, the group's new military chief designate. The Israeli military used a decade of intelligence to plan the attack, which involved dropping close to 100 bombs on the headquarters. US President Joe Biden called the killing of Nasrallah a measure of justice and expressed support for Israel's right to defend itself. Prime Minister Benjamin Netanyahu said the killing could change the balance of power in the Middle East.