3200 Palestinians have been detained by the Israeli authorities since the beginning of the year, the Palestinian Prisoners' Center for Studies (PPCS) said on Wednesday in a press statement.

PPCS asserted that administrative detention has become a strategy consistently employed by the Israeli authorities. While arrests have been made across all Palestinian areas including the West Bank and the Gaza Strip, around a third of the detainees were arrested in Jerusalem.

Israel's administrative detention policy allows for detainees to be held without charge for six-month intervals, which can be renewed indefinitely.

Administrative detention is detention without charge or trial authorized by administrative order rather than by judicial decree.

There are some 539 children, 180 women and 220 disabled people among the detainees. The statement also noted that around 400 detainees were rearrested after their release.

Palestinian prisoner Mohamed Allan, a hunger striker, was rearrested on 16 September after his administrative detention order was suspended in August due to his medical condition deteriorating.

Israel has defended its administrative detention policy saying it is a necessary tool for preventing attacks and protecting intelligence.

Israeli authorities this year have, according to PPCS, extensively relied on putting Palestinian citizens into administrative detention. Israeli courts have issued around 765 such orders in 2015, varying from first-time administrative detention to the long-term renewal of detention for some.

In recent years Israel has held thousands of Palestinians in administrative detention, for periods ranging from several months to several years, according to B'Tselem, a prominent Israeli center for human rights. The measure is rarely applied against Israelis.

Israel's use of administrative detention blatantly violates international law, B'Tselem have said on their website.

PPC, based in the West Bank, is a group made up of researchers and specialists in the issue of Palestinian and Arab prisoners inside Israeli prisons.