The London-based human rights group's statement came after the White House denied media reports that it is close to deciding the closure of the camp.

"Every day that this prison camp remains open is a day too many," Amnesty said, calling on other countries to "do all they can to bring an end to this human rights scandal and actively consider accepting released detainees".

"It is more than a year since (US) President (George W.) Bush first said he would like to close Guantanamo," the statement added.

"While there are undoubtedly challenges to closing the facility, the solution in principle is simple, and the government must turn its energies to this end.

"It should either charge the detainees with recognisable criminal offences and bring them to trial in the ordinary civilian courts, or it should release them with full protections against further abuses."

There are now about 375 "war on terror" detainees being held in Guantanamo Bay, according to Pentagon figures, many of whom have been detained for more than five years without being charged.