In November 2005, Egyptian authorities also released a group of 150 prisoners on similar conditions, most of them members of a separate Egyptian group, Al-Gamaa al-Islamiya.
The groups Islamic Jihad and al-Gamaa al-Islamiya lost a bloody 1992-1997 campaign to topple Hosni Mubarak, the Egyptian president. Earlier, in 1981, an Islamic Jihad fighter shot dead Anwar Sadat, the then-president of Egypt.
After Egyptian security forces crushed the movement, many members were jailed, and the group is not believed to have carried out any attacks since the mid-1990s.
Security sources were unable to say how many members from either group are still in prison.