The Israeli military bombed residential buildings south of Beirut on Friday that it said stood over the central headquarters of Hezbollah, barely an hour after Prime Minister Benjamin Netanyahu delivered a combative address to the United Nations in which he vowed to defeat the group and other Iranian-backed militias.

A huge blast shook the Dahiya, an area south of Beirut where Hezbollah holds sway, and thick black smoke began rising above the skyline, in what appeared to have been the most intense bombing in the area since the conflict between Israel and Hezbollah began last October.

The strike targeted Hassan Nasrallah, the cleric who since 1992 has led Hezbollah, the powerful Lebanese armed group and political party, according to Israeli and American officials, who spoke on the condition of anonymity to discuss intelligence. It was not immediately clear whether Mr. Nasrallah was killed, though there were growing concerns in Tehran that he was in the buildings when they were hit, three Iranian officials said.

Lebanon’s health minister, Firass Abiad, said the bombing had caused the “complete decimation” of four to six residential buildings. At least six people were killed and more than 90 others injured, the Health Ministry said, although Mr. Abiad warned that the toll was likely to rise.

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“They are residential buildings. They were filled with people,” Mr. Abiad told The New York Times. “Whoever is in those buildings is now under the rubble.”

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