Palestinian holders of foreign passports wait on a bus after arriving on the Israeli side of the... 
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Hamas remained defiant as the ground war began.
"You entered like rats," Hamas spokesman Ismail Radwan told Israeli soldiers in a statement on Hamas' Al Aqsa TV, broadcast shortly after the start of the invasion. "Your entry to Gaza won't be easy. Gaza will be a graveyard for you, God willing," he said.
"Gaza will not be paved with flowers for you. It will be paved with fire and hell," Hamas warned Israeli forces.
A text message sent by Hamas' military wing, Izzedine al-Qassam, said "the Zionists started approaching the trap which our fighters prepared for them." Hamas said it also broadcast a Hebrew message on Israeli military radio frequencies promising to kill and kidnap the Israeli soldiers.
"Be prepared for a unique surprise, you will be either killed or kidnapped and will suffer mental illness from the horrors we will show you," the message said.
Hamas has also threatened to resume suicide attacks inside Israel.
Hamas has long prepared for Israel's invasion, digging tunnels and rigging some areas with explosives. At the start of the offensive, Israeli artillery hit some of the border areas, apparently to detonate hidden explosives.
Before the ground invasion, defense officials said about 10,000 Israeli soldiers had massed along the border in recent days.
Israel initially held off on a ground offensive, apparently in part because of concern about casualties among Israeli troops and because of fears of getting bogged down in Gaza.
Israeli Prime Minister Ehud Olmert said his government decided to mount a land operation despite the risk it posed to thousands of soldiers.
An inner Cabinet of top ministers met with leading security officials for four hours Saturday before deciding to authorize the ground invasion.
Olmert told the meeting that Israel's objective was to bring quiet to southern Israel but "we don't want to topple Hamas," a government official quoted the prime minister as saying. The official spoke on condition of anonymity because he was not supposed to share the information.
The immediate aim of the ground operations was to take control of sites militants use as rocket-launching pads, the military said. It said large numbers of troops were taking part but did not give specifics.
Israeli airstrikes intensified just as the ground operation was getting under way, and 28 Palestinians were killed. Palestinian health officials said civilians were among the dead, including a woman, her son and her father who died after a shell hit their house.
One raid hit a mosque in the northern Gaza town of Beit Lahiya, killing 13 people and wounding 33, according to a Palestinian health official. One of the wounded worshippers, Salah Mustafa, told Al-Jazeera TV from a hospital that the mosque was packed.
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