Palestinian media has reported that some 1,000 Palestinian prisoners detained by Israel would go on a hunger strike to protest their living conditions.
Israel tightened restrictions after a dramatic jailbreak by six inmates last September, which led to widespread protest.
On Wednesday, a high-profile prisoner ended a six-month hunger strike after a deal with authorities.
Palestinians consider prisoners held by Israel one of their top issues.
There are some 4,500 Palestinians in Israeli prisons, according to Palestinian officials. About 700 of them are held without charge under what is known as administrative detention.
Israel says the measure is necessary for its security, but civil liberty groups say the practice is a violation of human rights.
The head of the Palestinian Authority’s prisoners’ committee said a further 1,000 detainees would join the hunger strike if the prisoners’ demands were not met.
The official Palestinian news agency, Wafa, said the action was a resumption of a hunger strike postponed in March after an agreement was reached between prisoners and the prison service. It accused the prison service of attempting to backtrack on the deal.
Palestinian prisoners have periodically staged or threatened hunger strikes as a tactic to pressure Israeli authorities to improve their conditions. They say conditions have got worse since six Palestinians were recaptured after tunneling out of a high-security jail last September and going on the run for nearly two weeks.
The episode was a severe embarrassment for Israeli authorities.