Israel's prime minister says he will not cave in to international pressure to stop a military offensive in the Gaza Strip. Benjamin Netanyahu told a news conference Friday that Israel has already struck 1,000 targets in Gaza and will continue its offensive until rocket fire out of Gaza is halted. “No international pressure will prevent us from acting with all power," he said.

However, the United Nations human rights chief voiced serious doubts that the operation complied with international law. "We have received deeply disturbing reports that many of the civilian casualties, including of children, occurred as a result of strikes on homes. Such reports raise serious doubt about whether the Israeli strikes have been in accordance with international humanitarian law and international human rights law," U.N. High Commissioner for Human Rights Navi Pillay said in a statement. Netanyahu said Israel is using twice the force it used during a similar offensive in 2012. More than 100 Palestinians have been killed.

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1100 strikes on #Gaza over 4 days. If you do the math that is: 1 strike every 5 minutes every day non-stop. 550 #Hamas rockets into #Israel - Ayman Mohyeldin (@AymanM) July 11, 2014

- Alastair Jamieson

The Associated Press and Reuters contributed to this report.