Benjamin Netanyahu told a news conference Friday that Israel will continue its offensive until rocket fire out of Gaza is halted.
He says he has had "good conversations" with a number of world leaders in recent days, including President Barack Obama and European leaders.
"No international pressure will prevent us from acting with all power," he said.
Netanyahu said Israel has attacked more than 1,000 targets in Gaza during the four-day operation and is using twice the force it used during a similar offensive in 2012. More than 100 Palestinians have been killed.
About the Gaza targets, the prime minister added "there are still more to go."
In remarks to reporters, he said he saw no international pressure on Israel to halt its campaign.
He also would not rule out the possibility of expanding the campaign of mostly aerial attacks into a ground war in Gaza, answering when asked whether such a move was possible that "we are weighing all possibilities and preparing for all possibilities."