Foad Al-Khafsh of the Detainees Society said As-Sumu village mayor Musa Abu Al-Hadayel was released after spending 19 months in an Israeli prison. It was not clear why he was jailed.
Al-Khafsh added that father-of-eight Al-Hadayel, 45, had previously spent six years in Israeli jail, and has a degree in physics. The reason for his detention was not specified.
Ahmad Hmeidan, 27, from Hebron, and Isam Def Allah, 24, from Ramallah, were released from Negev prison, Al-Khafsh said, without mentioning charges. Both men had been detained for 30 months.
