BEIRUT/JERUSALEM
 July 3 (Reuters) - An Israeli strike killed one of Hezbollah's top 
commanders in south Lebanon on Wednesday, prompting retaliatory rocket 
fire by the Iran-backed group into Israel as their dangerously poised 
conflict rumbled on.
The
 Israeli military said it had struck and eliminated Hezbollah's Mohammed
 Nasser, calling him commander of a unit responsible for firing from 
southwestern Lebanon at Israel.
Nasser,
 killed by an airstrike near the city of Tyre in southern Lebanon, was 
the one of the most senior Hezbollah commanders to die yet in the 
conflict, two security sources in Lebanon said.
Sparked by the 
Gaza war,
 the hostilities have raised concerns about a wider and ruinous conflict
 between the heavily armed adversaries, prompting U.S. diplomatic 
efforts aimed at deescalation.
Israeli
 Defence Minister Yoav Gallant said Israeli forces were hitting 
Hezbollah "very hard every day" and will be ready to take any action 
necessary against the group, though the preference is to reach a 
negotiated arrangement.
Hezbollah
 began firing at Israeli targets at the border after its Palestinian 
ally Hamas launched the Oct. 7 attack on Israel, declaring support for 
the Palestinians and saying it would cease fire when Israel stops its 
Gaza offensive.
Hezbollah
 announced at least two attacks in response to what it called "the 
assassination", saying it launched 100 Katyusha rockets at an Israeli 
military base and its Iranian-made Falaq missiles at another base in the
 town of Kiryat Shmona near the Israeli-Lebanese border.
Israel's
 Channel 12 broadcaster reported that dozens of rockets were fired into 
northern Israel from Lebanon. There were no reports of casualties. The 
Israeli Defence Ministry said that air raid sirens sounded in several 
parts of northern Israel.
Israel's
 military did not give a number of rockets launched but said most of 
them fell in open areas, some were intercepted, while a number of 
launches fell in the area of Kiryat Shmona.
It
 added that no injuries were reported but firefighters were working to 
extinguish a number of fires that were ignited by the rocket attack.
Following
 the rocket salvos, it said, Israeli fighter jets struck a Hezbollah 
launcher that was used to fire the barrages toward Israel as well as two
 additional launchers.
The
 sources in Lebanon said Nasser was responsible for a section of 
Hezbollah's operations at the frontier. One of the sources said a second
 Hezbollah fighter and a civilian were also killed.
Nasser
 was of the same rank and importance as Taleb Abdallah, a top commander 
who was killed by an Israeli strike in June, prompting Hezbollah to fire
 its 
largest barrages of drones and rockets yet in retaliation, the sources said.
The
 Israeli military statement said Nasser and Abdallah "served as two of 
the most significant Hezbollah terrorists in southern Lebanon".
Senior
 Hezbollah politician Hassan Fadlallah said Nasser had known he was a 
target but had not left the battlefield in nine months. Hezbollah would 
inflict its "punitive response" on Israel for "its crime, so that this 
enemy understands that the arm of the resistance is long", he said.
The
 hostilities have inflicted a heavy toll on both sides of the frontier, 
forcing tens of thousands of people to flee their homes.
Israeli
 attacks in Lebanon have killed more than 300 Hezbollah fighters and 87 
civilians, according to Reuters tallies. Israel says fire from Lebanon 
has killed 18 soldiers and 10 civilians.
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Reporting
 by Laila Bassam in Beirut, Maayan Lubell and Steven Scheer in Jerusalem
 and Jana Choukeir in Dubai; Writing by Maya Gebeily and Tom Perry; 
Editing by Alex Richardson, Gareth Jones, William Maclean