Israeli first responders said a man was killed on Thursday after rocket fire from Lebanon hit the northern Galilee region.

"Emergency medical technicians and paramedics have reported a 30-year-old male with no signs of life and have declared him deceased," the Magen David Adom emergency medical service said.

Successive rounds of Israeli strikes hit southern Beirut Thursday after Israeli military evacuation warnings, while Hezbollah claimed a series of attacks including on a base near south Israel's Ashdod, its deepest so far.

Lebanon's official National News Agency reported three raids "within the third round of strikes on the southern suburbs today", saying they hit the Haret Hreik and Hadath areas.

The Israeli military said Wednesday three soldiers, including a 70-year-old, were killed in south Lebanon, where its troops have battled Hezbollah since late September after a year of cross-border exchanges of fire.

The army announced two soldiers were killed in the same incident including 70-year-old reservist Ze'ev 'Jabo' Hanoch Erlich, after it had said earlier Wednesday that a 22-year-old soldier from Jerusalem "fell during combat in southern Lebanon".

Israeli strikes killed 79 pro-Iran fighters, including from Iraq and Lebanon, in the Syrian city of Palmyra, a monitor said Thursday, updating the toll for the raids a day earlier.

The toll was "the highest due to Israeli raids on pro-Iran groups in Syria since the start of the conflict" in the country in 2011, said Rami Abdel Rahman, head of the Syrian Observatory for Human Rights.

U.S. envoy Amos Hochstein, seeking to broker a ceasefire in the Israel-Hezbollah war, will meet Israeli Prime Minister Benjamin Netanyahu on Thursday, the premier's office said.

The announcement by spokesman Omer Dostri came after Israeli media outlets reported that Hochstein had arrived in Israel on Wednesday evening and held talks with Israeli Strategic Affairs Minister Ron Dermer. The Israeli Public Broadcasting Corporation described the Hochstein-Dermer talks as "constructive."

The United States on Wednesday vetoed a U.N. Security Council push to call for a ceasefire in Gaza that Washington said would have emboldened Hamas.

"We made clear throughout negotiations we could not support an unconditional ceasefire that failed to release the hostages," said U.S. ambassador to the United Nations Robert Wood.

Italy's defense ministry said Tuesday that Hezbollah staged an attack on a U.N. peacekeeping base in Lebanon that it had blamed on Israel.

Defense Minister Guido Crosetto said that Israel on Tuesday staged an "intolerable" new attack on the U.N. peacekeeping force in Shamaa.

The Lebanese army said Israeli fire killed a soldier on Wednesday, a day after it said three other personnel were killed in a strike on their position in south Lebanon.

South Lebanon has seen intense fighting between Israel and Hezbollah.

The Syrian defense ministry said 36 people were killed and more than 50 wounded in Israeli air strikes in the city of Palmyra on Wednesday.

"The Israeli enemy launched an air attack from the direction of the Al-Tanf area, targeting a number of buildings in the city of Palmyra," a ministry statement said, adding that it had killed 36 people and wounded more than 50, as well as causing "significant material damage".

Hezbollah said it carried out several attacks on Israeli troops near the border Wednesday.

Lebanon's official National News Agency reported Israeli shelling and air strikes in south Lebanon overnight and on Wednesday, saying Israeli troops were seeking to advance further near the town of Khiam.