JERUSALEM — More than 100 Hezbollah rockets struck northern Israel today, killing two Israelis and seriously wounding another, police said.

Police said 120 rockets had fallen, including one that crashed into a house in the Israeli Arab town of Mughar, killing one woman, police said. Another woman died in the town of Tiberias.

Rockets also fell on Kiryat Shemona and Carmiel, police said.

Police commander Dan Ronen said 45 rockets had fallen within a half-hour.

Eight Israelis were killed in two northern towns on Thursday. That prompted Israel to expand its pounding of Hezbollah positions across Lebanon today with missiles targeting bridges in the Christian heartland north of Beirut for the first time, an attack that further isolates Lebanon from the outside world.

Five civilians were killed and 19 wounded in the airstrikes north of the capital, Lebanese security officials said. A Lebanese soldier and four civilians were killed in air raids near Beirut's airport and southern suburbs, security officials and witnesses said.

The destruction of four bridges on the main north-south coastal highway linking Beirut to Syria further sealed Lebanon from outside links, as the Israeli naval blockade and earlier strikes against roadways have largely closed off other access points.

Fierce fighting continued along the border, and Hezbollah said in a statement broadcast by the group's Al-Manar TV station that guerrillas had killed six Israeli soldiers near the villages of Aita al-Shaab and Markaba.

Arab media reported Hezbollah had hit an Israeli tank. The Israeli army was not immediately available to comment on the claims.

The clashes came a day after a massive barrage of guerrilla rockets pounded northern Israel, killing eight people, and an offer by Hezbollah's leader to stop the attacks if Israel ends its airstrikes. Two more rockets hit northern Israel early today, causing little damage.

Israel's United Nations ambassador, Dan Gillerman, said that Sheik Hassan Nasrallah's offer of a truce was "a sign of weakness ... and he may be looking for a way out."

Gillerman warned against Hezbollah threats to launch rockets on Israel's commercial center of Tel Aviv. "We are ready for it, and I am sure that he (Nasrallah), as well as his sponsors, realize the consequences of doing something as unimaginable and crazy as that," the Israeli ambassador told CNN early today.

The Israeli military said the targets of the latest attacks in the southern Beirut suburb of Dahieh were Hezbollah facilities and a Hamas office. Beirut media said Israel launched 24 bombing runs in an hour.

South Beirut has been attacked repeatedly by Israeli warplanes since fighting began July 12.