WASHINGTON (AFP) - Prison conditions at the US naval base in Guantanamo Bay, Cuba are in line with the Geneva Conventions, said a Pentagon report " but it also called for the isolation of some inmates to be eased. Providing high-security detainees the chance for more social activity was "essential to maintain humane treatment over time", said Admiral Patrick Walsh, who presented the review findings on Monday. "In our opinion, the key to socialisation is providing more human-to-human contact; recreation activities with several detainees together; intellectual stimulation and group prayer," Walsh told reporters. Rights groups however were unimpressed, citing the report and other policy moves as proof that President Barack Obama had failed to make a clean break with the previous administration on the treatment of "war on terror" suspects. Guantanamo detainees "continue to be held in inhumane conditions that violate US obligations under Geneva conventions, the US constitution and international human rights law," said the New York-based Centre for Constitutional Rights. At Guantanamo "the majority of detainees are being held in condition of solitary confinement," the group said. "Sensory deprivation, environmental manipulation and sleep deprivation are daily realities for these men and have led to the steady deterioration of their physical and psychological health." The American Civil Liberties Union on Friday dismissed the report as a "whitewash" and demanded an independent review of conditions at Guantanamo instead of one carried out by the same US military that runs the prison. Rights groups last week expressed dismay after the Obama administration argued that inmates held at a prison in Bagram, Afghanistan did not have the right to challenge their detention in US courts. The Pentagon review of Guantanamo " required as part of an executive order issued by Obama in January mandating the closure of the detention camp " was released as Attorney General Eric Holder flew Monday to the US naval base for a first-hand look at the prison. Holder will meet US military officers in Guantanamo as the Obama administration determines how to close the camp, a lightning rod for criticism under former president George W Bush. Admiral Walsh declined to say whether detainees had been subject to torture or abuse since the prison was set up in 2002. "I was not in a position to look back," Walsh said. He added: "Is it in compliance today? ... our review says that it is." The report said anxiety among many of the detainees was directly tied to the uncertainty surrounding their legal fate. The review called for swift government action to release a group of 17 Chinese Uighurs, cleared of terror links but still under detention. The uncertainty over the date of their Guantanamo departure has "increased tension and anxiety within the detainee population," the report said. Washington has tried unsuccessfully for years to transfer the Uighurs to a third country, as US officials fear they risk being persecuted if they return to China. Human rights groups have urged the government to release the Uighurs in the United States, in an areas where there are Uighur communities. Former detainees and defence lawyers have alleged that some of the inmates were subjected to abuse at Guantanamo, particularly just after it opened in 2002, just months after the September 11, 2001 attacks. The US military review said detainees were being treated humanely and lawfully, and that interrogators were not using coercion to extract information. Walsh said, however, that the review team recommended that all interrogations of inmates be videotaped, saying "the use of video recordings provides the capability to monitor performance and maintain accountability."