The Israeli army says ground troops have crossed into southern Lebanon to carry out attacks on Hezbollah guerrilla outposts.
A spokesman said on Wednesday a small number of soldiers crossed the border for what he called "pinpoint attacks."
In recent days, Israeli forces crossed into southern Lebanon several times, but withdrew soon after destroying Hezbollah positions.
Israeli warplanes also are hitting targets in areas south of Beirut, in a Hezbollah stronghold already devastated by repeated bombings since Israel began its military offensive last week.
There were no immediate report of casualties from the latest air strikes.
On Tuesday, Israeli Prime Minister Ehud Olmert said Israel's offensive against Hezbollah will continue until two soldiers captured by the Islamic militant group are released and Israelis are safe.
About 30 Lebanese, including 11 soldiers, died in Israeli strikes throughout Lebanon Tuesday.
Hezbollah fired at least 100 rockets at northern Israel Tuesday, hitting Haifa and several towns. A rocket attack on Nahariya, near the Lebanon border, killed one person.
At least 235 Lebanese and 25 Israelis have died in fighting that erupted after Hezbollah guerrillas abducted two Israeli soldiers during a cross-border raid on July 12th.