There has been speculation in the Russian press that Mr Gorbuntsov was a witness to the murder attempt on Alexander Antonov in 2009.
Claiming asylum in Belgium, he said he had survived a murder attempt by the Taliban - allegedly a reprisal for his having worked as an interpreter for the US-led forces.
AbdulMutallab faces a federal indictment issued Wednesday, including an attempt to murder the other 289 people aboard.
AbdulMutallab, 23, faces a six-count federal indictment, including an attempt to murder the other 289 people aboard Flight 253.
Police said it was "clearly an attempt to murder police officers".
Tension heightened this March after an unsuccessful attempt to murder Anatoly Chubais, head of power company Unified Energy System, architect of Russian privatization and the "father of all Russian oligarchs, " as Pravda put it.
Colin Bell, 34, who was serving a life sentence at HMP Maghaberry for murder, hanged himself at the fourth attempt.
The Met co-commission is a fictionalized account of a British teenager who used the Internet in an attempt to arrange his own murder in 2003.
He suspects that the murder and the threats may be an attempt by agents of the old order to add to the difficulties of Mr Fox's government, which is already grappling with economic recession and internal disputes.
Lead defense attorney Mark O'Mara said he will try to use the evidence if prosecutors attempt to attack Zimmerman's character during his trial on second-degree murder charges, set to begin next month.
Taylor, appearing by video-link from Maghaberry prison, heard his attempt to kill Jonathan McKee described as a "serious aggravating factor akin to a multiple murder".
Meanwhile detectives have revealed that a third attempt to gain access to Ms Dando's private documents was made shortly before her murder by an unidentified man.
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