Follow NBC News' live coverage as Israel strikes Iran-backed groups across the Middle East after killing Hezbollah leader Hassan Nasrallah, and the Lebanon death toll rises.

The leader of the Hamas terrorist organization in Lebanon, Fateh Sherif Abu el-Amin, was killed in an airstrike in the Tyre area in the south of the country, Israel said on Monday. The Israeli confirmation came hours after the Gaza-based group said that he died in the attack along with several of his family members.

Palestinian militant group Hamas said an Israeli strike killed its leader in Lebanon on Monday, while another Palestinian militant group said three of its leaders were killed in a strike on Beirut, the first attack within the city limits.