. >> reporter: levinson was reported missing during a trip he took in 2007 to iran's kish island as avate investigator after he had retired from the fbi. iran has denied holding him, but u.s. investigators don't believe that. levinson's family hopes that seeming thaw in u.s.-iranian relations could lead to his release, although u.s. officials said today his case was not part of the recent talks in geneva. >> but we have raised -- repeatedly raised his case. >> reporter: iran has admitted to holding at least two other americans. amir hekmati, a former marine of iranian descent from michigan, visiting his grandmother but accused of being a spy and saeed abedini, an iranian-american pastor from idaho, sentenced to eight years in prison for establishing churches in iran. levinson's wife christine told me this seventh thanksgiving without bobby will be almost impossible to bear, as it will be for the other two families as well. >> so hard. okay, brian. thanks very much. >>> we turn now to a terrible tragedy caught on tape. families watching a veteran animal trainer play with a tiger he rai

public plea for iran to return a retired fbi agent missing for six years robert levinson disappeared kish island in 2007. the u.s. believes levinson was abducted and detained in iran. his case has come up in negotiations over iran's nuclear program. now to italy, italian prosecutor demanding appeals court find amanda knox guilty of murdering her british roommate. the british prosecutor recommend ago 26 year sentence. that's after two days of closing arguments in the knox retrial. in 2009, knox and former boyfriend were convicted of murder. two years later a second trial overturned the verdict and freed them from prison. knox did not return to italy for the third trail. now, to philadelphia, a convenience store clerk losing his job after fighting off a robber, brandon burrwell says a man came into the store, demanded money and came at him with a piece of metal. when burwell saw the weapon he fought back. instead of getting rewarded for stopping the robber. he was fired for violating store policy. workers are supposed to give up the money during the a robbery. now to australia. a tiger attack. cam

. >> he went on a business trip to kish island, part of iran. 24-hour trip. and he never left there. unfortunately, that was march 9th, 2007 and we have never heard anything about his whereabouts since then. his passport has not been seen. we have not received any recent information about him although i do believe he is safe and will come home to us soon. >> the white house has asked iran to help free him. the u.s. respectfully asked iran to help secure his return. now to asia, a challenge in the skies over the east china sea as the u.s. flies two bombers through china's newly declared air defense zone. the u.s. and japan criticized the move saying they won't recognize china's claim shown here on the map. this latest declaration comes during a territorial dispute with japan over a set of small islands in the east china sea. we have the view from both sides in this report from karl penhaul and david mckenzie. >> the message from beijing, we're watching you. >> defense officials a that he monitored the entire course of the american b-52 bombers as

>> he was last seen in iran on cu kish island.ier, his passport has never been seen anywhere else, but six and a half years have passed and we don't know exactly where he is at this moment in time. >> when you go to the state department and ask the government for help, what do they tell you? >> they are working as hard as they can to get him home. unfortunately, he disappeared in the country of iran, and it is very hard to get anything done there. we need the officials in iran to help us and make sure that bob is safe and get him home to us. >> and that's where the frustration comes in, certainly, dan, for you, where right now we're negotiating with iran, right now we're discussing what should be on the table in terms of establishing trust. there has been some news reporting given to pastor abedini, who has been held there supposedly for his practice of christianity. your father wasn't on the radar. do you think he should be part of this negotiation? >> we've been told and the u.s. officials have been saying in recent days he's br

. >> reporter: levinson was reported missing during a trip he took in 2007 to the kish island as a privateut u.s. investigators don't believe that. the levinson family hopes the seeming thaw in u.s.-iranian relations could lead to his release. although u.s. officials say his case was not part of the recent talks in geneva. >> we have raised, repeatedly raised his case. >> reporter: iran has been holding two other americans. levinson's wife, christine, told me this seventh thanksgiving without bobby will be almost impossible to bear, as it will be for the other two families, as well. brian ross, abc news, new york. >>> well, the u.s. sending a message to china. it doesn't buy its latest territorial claims. two b-52 bombers flew through contested air space in the china sea yesterday. the region is claimed by china, japan and taiwan. this week china said it controls that air space and all flights must comply with there's been no reaction by the chinese to the two u.s. flights. >>> another message to the faithope almost a complete turnaround traon a denouncing the global financial system that