In the deadliest single incident in the ongoing Israel-Hezbollah conflict, An Israeli airstrike demolished a three story building in the village of Qana in southern Lebanon, reportedly killing at least 54 displaced civilians, about 37 of them children, who were sheltering there.

Lebanese Prime Minister Fouad Siniora called it Israel's "heinous crimes against civilians", and called off a scheduled meeting with US Secretary of State, Condoleezza Rice saying "There is no place on this sad morning for any discussion other than an immediate and unconditional ceasefire as well as an international investigation into the Israeli massacres in Lebanon now."

Anger spread across Lebanon and the Arab world, several thousand protesters gathered in front of the United Nations headquarters in Beirut and some smashed their way into the building. The protesters chanted "Death to Israel, Death to America".

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Wikipedia has an article about Second Qana shelling.

Israeli raid in Lebanon kills 54 - Reuters.com