The number of administrative detainees increased by 800 in just a month and they now make up close to 40 percent of all Palestinians held by Israel, said HaMoked, which gets the statistics from the Israel Prison Service.

Israeli authorities often keep the allegations against the detainees secret, preventing them from mounting an informed defense.

Rights groups say the practice amounts to a serious violation of due process. The detentions can range from a few months to years, and authorities often extend them for unknown reasons.

Since the start of the Israeli war on Gaza two months ago, the number of administrative detainees has more than doubled, as near-nightly raids into Palestinian communities across the occupied West Bank and the occupied east Jerusalem bring in hundreds of Palestinians on suspicion of association with resistance groups or incitement on social media.

The total number of Palestinian security prisoners in Israeli prisons is now 7,677, up roughly 700 in one month, HaMoked said.

Over the past week, 240 Palestinian women and minors were released by Israel as part of a truce deal with Hamas, which in turn freed more than 100 captives held in Gaza.