Amnesty International (AI) Thursday expressed renewed alarm at the inhuman conditions in which the overwhelming majority of detainees are held in by America at its concentration camp in Guantanamo bay, Cuba.

The London-based human rights group said that 80 percent of the detainees being held for more than four years without charge or trial were subjected to solitary confinement.

The human rights group, which has long called for the closure of the entire camp set up outside America jurisdiction, also called for independent medical experts to be allowed to examine the prisoners.

In its latest report, it estimated that there were approximately 385 men still held at the camp and that after an apparent hardening of America operational detention policy in January, around 300 are now being held in three units with minimal contact with others.

Coming after the recent release of UK resident Bisher al-Rawi, who was held for over four years, Amnesty said that the refusal by Prime Minister Tony Blair's government to help all British residents was untenable and unacceptable.

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