Hezbollah leader Hassan Nasrallah was killed in an Israeli airstrike last year while inside the group's war operations room, according to a senior Hezbollah official. The assassination of Nasrallah turned low-level strikes between Israel and the militants into all-out war that lasted for two months. Hezbollah's current leader warned that its fighters could strike Israel if its troops don't leave the south by the end of the month. Israel's defense minister echoed similar sentiments.