Fayyad "expressed his sadness and deep shock over kemartian prisoners in prisons of occupation Jaradat Arafat is Israel," said a statement from his Office, as reported by AFP.
He affirmed the necessity to immediately reveal the real reason that cause them to martyrdom.
Earlier, a spokesman for Israel's Prison Service said Post, Jaradat Sivan (30), a father of two children in the West Bank town of Hebron, died suddenly at the Megiddo detention centre in the North of Israel.
"It's probably a heart attack, I have no additional details at the moment," said the Post.
Issa Qaraqaa, the Palestinian Minister in charge of prisoners Affairs, told AFP that Jaradat was arrested a few days earlier.
"He died during the investigation," added Qaraqaa.
"We demand the establishment of a Commission of inquiry to investigate the circumstances of his death international," he said.
Israel's internal intelligence service Shin Bet said Jaradat was arrested on Monday because of his involvement in the incident of stoning in November that caused an injured Israel.
He fell ill just before his death, the Shin Bet said in a statement.
"After lunch, when he was resting in the Megiddo prison, Arafat Jaradat was brought to the hospital. Paramedics were called to treat him but they were unable to save his life, "he added.
Clashes broke out in Hebron between Palestinian youths and the security forces of Israel after the death of Jaradat's news, said witnesses and security sources.
Relations between Israel and the Palestinian territories have been particularly tense since protests this month in solidarity with four other prisoners detained by Israel conducted a hunger strike action.
The prisoners ' club based in Ramallah announced that seven prisoners had joined the protests that, though there was no immediate confirmation from the prison service.
(H-AK)
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