Six Palestinian prisoners held in Israel held without trial or charge in solitary confinement entered into day 13 of their hunger strike August 31 in protest against their detention, Ma’an News Agency reported Monday.

The Palestinian Prisoner’s Centre named the men as Nidal Abu Aker, 48, Shadi Maali, 39, Ghassan Zawahreh, 32, from Bethlehem, and Badr al-Ruzza and Munir Abu Sharar from Hebron.

The men began a hunger strike August  18 to protest their detention the Palestinian Prisoner's Center said.

The announcement comes after a string of high profile hunger strikes ended in Palestinian detainees being released by Israeli authorities from administrative detentions  for medical treatment.

Mohammad Allan, an alleged member of Palestinian political party and resistance organisation Islamic Jihad, which is considered a terrorist organisation by the West and Israel, was recently released from administrative detention after a 66-day hunger strike following a sharp decline in Allan’s physical health.

Adnan Khader was released from an administrative detention following a 56 day hunger strike in May. It was the tenth time Israeli authorities had held Khader in administrative detention.

The Israeli parliament approved a law July allowing prisoners on hunger strike facing death to be force fed. Due to widespread protest against the new law in Israel and Palestine, the law has yet to be enforced.

Administrative detention, a holdover from the British Mandate, is detention without charge or trial that is authorized by administrative order rather than by judicial decree. Administrative detentions typically last up to six months but can be renewed indefinitely.

Israeli authorities renewed the detentions of nearly 480 Palestinians held in Israeli administrative detention, researcher for prisoners’ affairs Riyad al-Ashqar announced. Seventy five detainees are having their detentions renewed for the fourth time. Israel has issued over 700 administrative detention orders since the beginning of 2015.