The security official, who spoke anonymously, said rescue workers at the scene were trying to reach survivors who were calling out for help. He believed that among those trapped, more were alive than dead.
Local television stations reported rescuers had pulled out 65 survivors, including 35 children, from under the rubble.
Saniora disclosed the attack in the village, where heavy ground fighting between Hezbollah guerrillas and Israeli has been raging in recent days, in an impassioned opening address to a hastily convened meeting of Arab foreign ministers who met in Beirut to show solidarity with Lebanon's government and people who have been under intensive Israeli airstrikes since July 12.
Syria's foreign minister, Walid Moallem, abruptly walked out of the meeting Monday. While leaving, he refused to answer reporters' questions.
The reason for his departure was not immediately clear.
On Sunday, Moallem told reporters that "Syria is ready for the possibility of a regional war" if Israel attacks his country.
In his opening remarks to the ministers, Saniora had to interrupt his remarks several times to choke back tears and wipe his eyes. The ministers broke out in applause.
He said Israel's attacks took "our country back decades. We are still in shock."
The Arab foreign ministers' meeting comes as a US-French plan to end the Israel-Hizbullah fighting has opened deep divisions among Lebanese leaders.
Moallem said Monday that the foreign ministers would discuss the possibility of holding an emergency summit on Lebanon later this week.
Local media outlets had quoted Saudi sources as saying Saudi Foreign Minister Saud al-Faisal was expected to make the call for a summit during Monday's ministerial meeting in Beirut.
Lebanon's