Brian Knowlton IHT WASHINGTON U.S. officials will soon release five of the nine British citizens detained at the prison camp at Guantanamo Bay, Cuba, the British government announced Thursday. All were captured while allegedly fighting alongside Taliban militants against U.S. and British troops in Afghanistan A Spaniard was returned Friday to Spain, where he reportedly faced immediate interrogation by a magistrate investigating terrorism. The fate of about 10 other European detainees, including French, Swedish and German nationals, remained unclear. Negotiations over the release of British detainees had rotated partly around the sticky question of whether they would be jailed, tried or freed upon returning home. The Pentagon has announced plans to establish a panel to review detainees’ cases annually to see which of them posed no threat and could be released. But senior Defense Department officials said Feb. 12 that they expected to keep large numbers of the detainees for many years, even indefinitely. Some of the roughly 650 detainees have been held for as long as two years without being charged. To date, nearly 90 detainees have been released, and U.S. officials have suggested that more than 100 of those deemed less dangerous might be eligible for eventual release.