Israeli soldiers stand on their APC's and gesture towards the Gaza Strip on Jan. 2, 2009 near Israel's border with the Hamas-run territory.
( David Silverman/Getty Images)More Photos
On Monday, Israeli Foreign Minister Tzipi Livni told reporters the military was targetting only Hamas and that Hamas "hides among civilians."
Thursday, Israeli air strikes killed senior Hamas leader Nizar Rayyan. His four wives and 11 children were also killed by the 2,000 pound bomb.
The ground invasion began on a day of protest throughout Europe against Israel's offensive in Gaza -- with demostrators turning out in Paris, Berlin, Athens, Rome and 18 cities in Great Britain.
Up to 12,000 people gathered in London's Trafalgar Square, where protestors expressed anger at what they saw as a disproportionate response by the Israelis, ABC News Radio's Tom Rivers reported.
"Killing 100 Arabs for every Jew that is killed is not proportionate," Former London Mayor Ken Livingstone told the crowd. "It is a war crime."
Livingstone said he hoped the demonstration would send a powerful message to British Prime Minister Gordon Brown, and he said he described the silence of most Western governments to the Israeli attacks as obscene.
ABC News' Simon McGregor-Wood, Mimi Daher, Tom Rivers and Tom McCarthy contributed to this report.
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