Lawyers say prisoners are subjected to:

• violent shaking which can lead to unconsciousness
• hanging by their wrists
• sleep deprivation
• exposure to extreme temperatures
• deafening music

They estimate around 85% of all Palestinians detained in Israel in a given year are tortured by the government's Shin Bet security agents.

Israel says it is only trying to stop terrorism

Lawyers who defend Palestinian detainees say prisoners are also routinely threatened with death and have threats made against their families.

But the Israeli Government says Shin Bet only employs "moderate physical pressure" to extract information from suspects believed to have direct knowledge of imminent bomb attacks.

The state's attorney has argued that "the national interest must prevail over human rights" in the fight against terrorism.

But the United Nations Committee Against Torture decided in 1998 that the interrogation practices amounted to torture.

International ramifications

According to one human rights group, Betselem, at least 850 Palestinians are tortured each year by Shin Bet agents. A second group, the Public Committee Against Torture in Israel, puts the number at more than 1,000.

The petition is being considered by a nine-judge panel headed by Chief Justice Aharon Barak.

The High Court has heard numerous petitions aimed at stopping the alleged torture of individual detainees, but this hearing is the first on the overall legality of the Shin Bet interrogation practices.

Eitan Felner, head of Betselem, said if the court rejects their petition, it could set a dangerous precedent worldwide.