Israel launched its military operation - the largest since the start of the Palestinian uprising in September 2000 - after a wave of suicide bomb attacks.
Troops and tanks moved into Palestinian controlled areas across the West Bank. Heavy fighting broke out in Jenin, Nablus, Ramallah and Bethlehem.
The Israeli army says 30 soldiers have been killed. Palestinian casualties were markedly greater, but their true number and the balance between armed fighters and civilians is far from clear.
Troops have started to withdraw from Jenin, Nablus and parts of Ramallah, but are likely to remain in Bethlehem.
The army is continuing to mount smaller, limited operations in other West Bank towns.
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