Israel is firing strikes into Lebanon as the conflict in the Middle East intensifies. Israel believes it has eliminated around 30 top Hezbollah leaders over the last several weeks, including Hezbollah leader Hassan Nasrallah, who was killed in an Israeli airstrike in Beirut on Friday, U.S. and Israeli officials said.

Follow NBC News' live coverage as Iran responds to Hezbollah leader Hassan Nasrallah's killing in an Israeli strike.

The strikes hit several buildings in Dahieh, Hezbollah’s stronghold in the south of the city. Israel Defense Forces spokesman Rr Adm Daniel Hagari said a "very accurate" strike had been carried out on Hezbollah headquarters

More than 1,000 people have been killed in Israeli attacks on Hezbollah in the past two weeks, officials said, as Lebanon braces for a possible ground invasion.

The last 48 hours in the Middle East – in which Israel killed Hezbollah leader Hassan Nasrallah and continued to bombard the Iran-backed group across Lebanon – have once more ratcheted fears that this long-running conflict could spiral into a wider regional war.

Nearly a year after Hamas’ unprecedented assault shattered their spirits, Israelis are in a triumphant mood over the pummeling their military has given Lebanon’s Hezbollah and the killing of its elusive leader.

On Saturday, Hezbollah confirmed that its leader, Hassan Nasrallah, is dead after Israel announced he was killed in an airstrike in Beirut on Friday.

Israel said it bombed Houthi targets in Yemen on Sunday, expanding its confrontation with Iran's allies in the region after killing the Hezbollah leader Sayyed Hassan Nasrallah on Friday in an escalating conflict in Lebanon.

Israel said Sunday it killed another senior Hezbollah official in an air strike on the Lebanese capital after dealing the Iran-backed group a seismic blow by assassinating its leader, Hassan Nasrallah.