Israel says it has arrested 200 members of the Hamas and Islamic Jihad groups in the past week and taken them into its territory for questioning.
A statement said some of the suspects had been hiding among the civilian population and surrendered voluntarily.
Israel says 700 Palestinian militants have been arrested since it launched its military operation and invasion of Gaza with the aim of eliminating Hamas.
Israel launched its retaliatory operation after Hamas fighters crossed from Gaza into southern Israel on October 7, killing 1,200 people and taking about 240 hostages.
At least 20,000 people have been killed and 50,000 injured in Gaza since then, according to the Hamas-run health ministry.
Israel has kept up its bombing campaign in Gaza – ordering civilians to flee.
The UN said the latest order affected 150,000 people in the middle of the Strip.
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