He spoke in an interview with the Al-Jazeera news network taped Thursday to show he had survived a heavy airstrike in south Beirut that Israel said targeted a Hezbollah underground leadership bunker. The guerrillas said the strike only hit a mosque under construction and no one was hurt.

The U.N. estimated that about a half-million people have been displaced in Lebanon, with 130,000 fleeing to Syria and about 45,000 believed to be in need of assistance.

In preparation for a more powerful punch deeper into Lebanon, an Israeli military radio station that broadcasts into the south issued what it called "a strict warning" that Israeli forces would "act immediately" to halt Hezbollah rocket fire.

"It will act in word and deed inside the villages of the south against these aggressive terrorist acts. Therefore all residents of south Lebanon south of the Litani must leave their areas immediately for their own safety," the message in Arabic on the Al-Mashriq station said.

More than 300,000 people are believed to live south of the Litani - which twice has been the border line for Israeli buffer zones. In 1978, Israel invaded up to the Litani to drive back Palestinian guerrillas, withdrawing from most of the south months later.

Israel invaded Lebanon again in a much bigger operation in June 1982 when its forces seized parts of Beirut. It eventually carved out a buffer zone that stopped at the Litani. That zone was reduced gradually but the Israeli presence lasted for 18 years until 2000, when it withdrew its troops completely from the country.