hey wrote the names of the dead children on their plastic shrouds. " Mehdi Hashem, aged seven ­ Qana," was written in felt pen on the bag in which the little boy's body lay. "Hussein al-Mohamed, aged 12 ­ Qana", "Abbas al-Shalhoub, aged one ­ Qana.'' And when the Lebanese soldier went to pick up Abbas's little body, it bounced on his shoulder as the boy might have done on his father's shoulder on Saturday. In all, there were 56 corpses brought to the Tyre government hospital and other surgeries, and 34 of them were children. When they ran out of plastic bags, they wrapped the small corpses in carpets. Their hair was matted with dust, most had blood running from their noses.

You must have a heart of stone not to feel the outrage that those of us watching this experienced yesterday. This slaughter was an obscenity, an atrocity ­ yes, if the Israeli air force truly bombs with the " pinpoint accuracy'' it claims, this was also a war crime. Israel claimed that missiles had been fired by Hizbollah gunmen from the south Lebanese town of Qana ­ as if that justified this massacre. Israel's Prime Minister, Ehud Olmert, talked about "Muslim terror" threatening " western civilisation" ­ as if the Hizbollah had killed all these poor people.

And in Qana, of all places. For only 10 years ago, this was the scene of another Israeli massacre, the slaughter of 106 Lebanese refugees by an Israeli artillery battery as they sheltered in a UN base in the town. More than half of those 106 were children. Israel later said it had no live-time pilotless photo-reconnaissance aircraft over the scene of that killing ­ a statement that turned out to be untrue when The Independent discovered videotape showing just such an aircraft over the burning camp. It is as if Qana ­ whose inhabitants claim that this was the village in which Jesus turned water into wine ­ has been damned by the world, doomed forever to receive tragedy.

And there was no doubt of the missile which killed all those children yesterday. It came from the United States, and upon a fragment of it was written: "For use on MK-84 Guided Bomb BSU-37-B". No doubt the manufacturers can call it "combat-proven" because it destroyed the entire three-storey house in which the Shalhoub and Hashim families lived. They had taken refuge in the basement from an enormous Israeli bombardment, and that is where most of them died.

I found Nejwah Shalhoub lying in the government hospital in Tyre, her jaw and face bandaged like Robespierre's before his execution. She did not weep, nor did she scream, although the pain was written on her face. Her brother Taisir, who was 46, had been killed. So had her sister Najla. So had her little niece Zeinab, who was just six. "We were in the basement hiding when the bomb exploded at one o'clock in the morning,'' she said. "What in the name of God have we done to deserve this? So many of the dead are children, the old, women. Some of the children were still awake and playing. Why does the world do this to us?"

Yesterday's deaths brought to more than 500 the total civilian dead in Lebanon since Israel's air, sea and land bombardment of the country began on 12 July after Hizbollah members crossed the frontier wire, killed three Israeli soldiers and captured two others. But yesterday's slaughter ended more than a year of mutual antagonism within the Lebanese government as pro-American and pro-Syrian politicians denounced what they described as " an ugly crime".

Thousands of protesters attacked the largest United Nations building in Beirut, screaming: "Destroy Tel Aviv, destroy Tel Aviv," and Lebanon's Prime Minister, the normally unflappable Fouad Siniora, called US Secretary of State Condoleezza Rice and ordered her to cancel her imminent peace-making trip to Beirut.

No one in this country can forget how President George Bush, Ms Rice, and Tony Blair have repeatedly refused to call for an immediate ceasefire ­ a truce that would have saved all those lives yesterday. Ms Rice would say only: "We want a ceasefire as soon as possible,'' a remark followed by an Israeli announcement that it intended to maintain its bombardment of Lebanon for at least another two weeks.