A UN expert has said he is appalled by the "continuing human rights violations in Israeli prisons", as Palestinian inmates continue a mass hunger strike. Special Rapporteur Robert Falk said Israel had to treat hunger strikers in line with international standards. Israel's Prison Service says some 1,550 Palestinians in jail are on strike.  Doctors have expressed serious concern about two men who have been refusing food for 63 days in protest at being detained without charge or trial. The Israeli group, Physicians for Human Rights (PHR), is pressing for Bilal Diab and Thaer Halahla to be transferred to a civilian hospital, saying their lives are now "endangered". A PHR doctor examined them at the Ramle prison clinic, near Tel Aviv, on Monday. She found that both were not receiving adequate medical care. "Both have stopped co-operating in any way with the Israeli Prison Service doctors. They are not taking vitamins or salts on the IV [intravenous] drip," PHR spokeswoman Amani Dayif told the BBC. "Bilal is only drinking water, less than a litre per day. He's in danger of cardiac arrest," she warned. (Reference for text: BBC. Photo: Aljazeera.net)