Al Jazeera's Alan Fisher, reporting from the Israel-Gaza border, said the move appeared to be in preparation for the so-called third stage of Israel's offensive: moving troops into the towns and cities of Gaza to fight door-to-door.
Israel has confirmed sending thousands of army reservists into Gaza, raising concerns that a "third stage" of its offensive - going deeper into urban centres - could soon begin.
As the offensive entered its 17th day on Monday, Al Jazeera's Zeina Awad reported from the Israel-Gaza border that Israeli aircraft had sustained its bombardment through the night.
The Israeli military said that it had undertaken 10 air attacks overnight, while witnesses reported that ground battles took place in the east and north of Gaza City.
Ehud Olmert, the Israeli prime minister, said his troops were close to meeting their objectives in Gaza, but stopped short of giving a timeline for ending the conflict.
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