OKLAHOMA CITY: A new mystery surfaced in the Oklahoma City bombing yesterday - just days before formal charges were to be lodged - when officials disclosed that a severed leg and foot clad in a combat boot had been found in the rubble. The state medical examiner's announcement, more than two months after the authorities said all victims were accounted for, came after the lawyer for Timothy McVeigh, the prime suspect in the bombing which killed 167 people, said he would ask prosecutors to explore information that a severed leg had been found that could not be matched to a body. The leg was found amid rubble near the centre of the blast. The lawyer, Stephen Jones, speculated that the leg and foot may have belonged to 'the real bomber' who could have been blown apart in the explosion. The possibility that there might be another participant in the bombing came as the deadline neared for federal prosecutors to bring indictments against McVeigh and another army veteran, Terry Nichols. A third member of the same army unit from Fort Riley, Kansas, Michael Fortier, is also likely to be indicted, although he has been negotiating for leniency in exchange for his testimony and may be charged with lesser offences. Fortier's wife, Lori, was brought to the federal courthouse in Oklahoma City on Monday for a meeting with a judge in which she was granted immunity from prosecution in exchange for her testimony before the grand jury. Mrs Fortier's immunity was a key element in the deal that Fortier was attempting to strike with federal prosecutors. The existence of an unknown body could change the complexion of the case. One possibility is that the leg belonged to the second man some witnesses reported seeing, allegedly with McVeigh, in the period just before the bombing but whom investigators have never been able to identify. Thus far, despite a huge search for a 'John Doe II', federal investigators have not identified any other participants. The medical examiner's office, in a statement issued on Monday, said it was continuing to analyse unidentified human tissue recovered from the Alfred Murrah Federal Building, among which 'is a traumatically amputated left thigh and lower leg recovered on May 30, 1995'. 'This leg was clothed in a black military-type boot, two socks, and an olive drab blousing strap,' it said. The statement added: 'Anthropological analysis of this specimen reveals the individual to be light-skinned, dark-haired, probably less than 30 years of age, male (75 per cent probability), and having an estimated height of 66 inches [167 centimetres], plus or minus three inches. This leg has not been matched to any other known victims or survivors.' The operations director of the medical examiner's office, Ray Blackeney, said the severed leg had been found after the last three identified bodies were removed from the building, an operation that had been delayed because rubble had to be removed from above the site near the centre of the blast, for fear of collapse. At the time of the recovery of the three bodies, Mr Blackeney had dismissed the possibility that a bomber was killed in the blast, saying: 'As far as I'm concerned, he's not there. We have found the people where we thought we would find them. We didn't find anybody we didn't think was there.' But the place where the leg was found, further down in the rubble near the centre of the blast, would be consistent with someone in or near the exploding truck. In addition, the medical examiner's office said the leg was the largest identifiable body part, suggesting the rest of the individual had disintegrated from the force of the explosion.