Jerusalem ( CNN ) -- Tensions in the West Bank are heightened after the recent death in an Israeli prison of a 30-year-old Palestinian arrested last week . Arafat Jaradat died Saturday , inciting Palestinian officials to once again decry conditions in Israeli prisons . `` The prisoner martyr Jaradat went to prison to come back a corpse , but we are determined to find out how it was done and who did it , '' Palestinian Authority President Mahmoud Abbas said Monday , according to the state news agency WAFA . `` We know how we will act , and we will not let them ( Israelis ) drag us to their square , and they should bear the responsibility . '' The United Nations weighed in Monday , calling for a thorough probe into Jaradat 's death . `` The United Nations expects the autopsy to be followed by an independent and transparent investigation into the circumstances of Mr. Jaradat 's death , the results of which should be made public as soon as possible , '' Robert Serry , the U.N. special coordinator for the Middle East peace process , said in a written statement . Israel said doctors had worked to save the inmate , who was suffering from previous injuries . Palestinian officials said Jaradat was tortured . Palestinians in Israeli prisons -- about 4,500 people -- took part in a hunger strike Sunday , and crowds protested in the streets of the West Bank as Palestinian officials called for an international investigation into an inmate 's death . Palestinian officials told CNN that Jaradat is the 203rd Palestinian to die in Israeli prisons since 1967 . He was buried Monday near his home in the West Bank as dozens of masked members of al-Aqsa Martyr 's Brigade -- the armed wing of Fatah -- fired rifles in the air in protest . `` They killed him only in five days , '' his sister told Palestinian TV . `` They kidnapped him from life . Oh , my dear little brother ! Oh , my love ! '' A Palestinian official sent a warning Sunday to U.S. President Barack Obama , who plans to make his first trip to Israel as president next month . `` If President Obama wants to visit the region peacefully , he should exert pressure on Israel to release the prisoners -- especially the ones who are on hunger strike -- or else he will visit while Palestine is on fire , '' Minister of Prisoner Affairs Issa Qaraqe said . Israeli officials Sunday called on the Palestinian Authority to calm the territories , where there have been large protests in recent days over the conditions of Palestinian prisoners . Israeli Prime Minister Benjamin Netanyahu 's liaison with Palestinians , Yitzhak Molco , passed on the demand for calm to the Palestinian Authority , Israeli government officials said . Jaradat 's death came amid a fury -- and a series of questions -- surrounding the death of a prisoner in 2010 , referred to as `` Prisoner X . '' Details came to light in recent days after a court document was released . Jaradat had been held for interrogation since Monday for a 2011 incident in which an Israeli citizen was injured by rock-throwing Palestinian protestors . Jaradat confessed , Israeli security sources said . Human Rights Watch called on Israel on Saturday to `` immediately charge or release Palestinians detained without charge or trial for prolonged periods . '' Palestinian prisoners in Israeli detention are one of many flashpoints in the Middle East conflict . Prisoners have launched hunger strikes in the past in hopes of bringing attention to their cause and pushing Israel to ease conditions or allow some prisoners to leave . Israeli officials have said that prisoners include members of extremist groups who have `` blood on their hands . '' In October 2011 , Israel freed more than 1,000 Palestinian prisoners -- including hundreds serving life sentences for attacks on Israelis -- in exchange for one person : Israeli soldier Gilad Shalit , who had been held by Hamas for more than five years . `` The United Nations appeals for maximum restraint by all parties to prevent further violence . The United Nations will continue engaging with the parties on the ground with a view to finding a solution that addresses the plight of prisoners and preserves the calm , '' Monday 's U.N. statement said . CNN 's Kareem Khadder reported from Jerusalem ; Steve Almasy wrote the story in Atlanta .
Arafat Jaradat had been unconscious for two hours when he died . Palestinian president says Israelis killed him . Israeli ##s say he had previous injuries , calls for investigation . U.N. calls for transparent investigation into death .