Of air strikes is just the beginning of revenge against the terror group. The air force hit a series of targets friday. Activists tell us those strikes killed dozens of militants. The terror group claims one of the jordanian strikes killed kayla mueller, an american aid worker and their hostage since 2013. Muellers family released a statement late friday appealing to isis directly. It reads in part we are still hopeful that kayla is alive. We have sent you a private message and ask that you respond to us privately. You told us that you treated kayla as your guest, as your guest her safety and well being remains your responsibility. U. S. And jordanian officials have doubts about muellers death calling this and isis a Public Relations stunt. We have more from amman, jordan. Becky, its obviously heartbreaking for Kayla Muellers family that shes being used as a pawn in the isis Propaganda Machine. What has been the reaction in jordan . Reporter it was very swift, the reaction. The interior minister telling me that this was a publicity stunt, calling it lies lies lies. And saying that the isis Propaganda Machine was trying to drive a wedge between jordan and the rest of the International Coalition. Its very difficult to get details out at this point. We have heard from an activist this morning who says that 47 isis militants were killed in air strikes on friday and these air strikes hitting ammunition dumps. So that is the story there. Weve also heard from an activist that isis killed some 20 prisoners who tried to escape and the suggestion is that the area is becoming a slaughterhouse effectively. Jordan is now the latest country to join the fight against isis as youve rightly pointed out, after a video surfaced showing isis members burning a jordanian pilot to death, of course. Atika schubert reports on jordans efforts to stop this terror group. Reporter ever since isis released horrific video of the jordanian pile being murdered pilot being murdered jordan has been the spearhead in the fight against isis alongside coalition forces. Plane after plane loaded with bombs and taking off, delivering one punishing strike after another on isis positions deep in syria. Now isis claims one of those strikes hit this building on the outskirts of the town killing inside 26yearold american aid worker kayla mueller, held hostage since august 2013. But isis gave no evidence to back up their claim. Jordan says it is investigating but warned that this is a macabre p. Are. Stunt designed to divide the coalition. What we know about this terrorist organization is that they are liars when it comes to these things. They use these events to manipulate facts and to manipulate public opinion. We think this is part of their propaganda. Reporter for the last month, jordan says it had been negotiating for the safe transfer of downed air pilot kasasbeh only to find he had been murdered weeks ago, burned alive in a cage and released for the world to see. Jordan has vowed revenge, and its jets have delivered. Isis unproven claims are untrial stop those bomb from dropping. Unlikely to stop those bomb was dropping. Reporter although kayla was only 26 she spent much of her life helping people. Anderson cooper takes a closer look at a woman known as a citizen of the world. Reporter Kayla Jean Mueller is from prescott arizona, but is best be described as a citizen of the World Investment high school she volunteered for the save darfur coalition. According to her local paper, staged silent protests for the cause. In college at Northern Arizona university she became president of a group called stand, a studentled movement to end mass atrocities. After graduation she traveled first to northern india. Then to israel and the palestinian territories working for humanitarian organizations. By 2011 syria was beckoning. She spoke about it in this online post. I am in solidarity with the syrian people. I reject the brutality and killing that the syrian authorities are committing against the syrian people. Reporter in 2012 mueller made her first trip to the syrian turkish border. She was working for aid groups supporting syrians fleeing the violence in their country. On a trip home in may of 2013, she spoke to her local paper about her experiences saying when syrians hear im an american, they ask, where is the world . All i can do is cry with them because i dont know. She returned to the region and in just about two months after the interview was taken hostage. She was leaving a hospital in aleppo when she was kidnapped. Her family wouldnt hear about her fate until may of 2014 10 months after she was captured. Isis provided proof of life and demanded nearly 7 million or they will kill her august 13th. Mueller is believed to have survived that deadline but any negotiations with isis that may have taken place for her release have been secret. She was held hostage during the same time and perhaps at points in the same cell as three other americans james foley, steven sotloff, and abdulera ra man kassig. She had gone to provide any help she could. She said syrians are dying by the thousands and are fighting just to talk about the rights we have. She went on to say, for as long as i live ill not let the suffering be normal. Reporter yes, very difficult times here. The flags in jordan still flying at half staff, mourning period continues down in the south for the young pile soot so brutally murdered. The jordanians doing what they can to illicit more information from there. The interior minister linda telling me this is lies lies lies. Publicity stunt driving a wedge, they say, an attempt at least to drive a wedge between those who are fighting this war against this militant group. Back to you. Okay Becky Anderson in amman, jordan. Thank you very much. Talk to you soon. The u. S. Is gathering intelligence on isis in mosul iraq to decide whether to recommend sending in american Ground Troops to help in the fight against the terrorist group. The u. S. Says isis is trying to reign forces defenseless in iraqs second largest city. Members are protecting their families by moving them out of the area. Top u. S. Officials say a small number of troops could be needed to help targeting isis but would not go into combat. Coming up possible progress now toward ending the fighting in ukraine. World leaders meet in a new push for peace. Details ahead. Plus a new respect reveals piles of transasia 2035 may have turned off their only working engine. [ male announcer ] an important free offer for men with balding or thinning hair. 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[ male announcer ] call now for our free dvd and brochure, shipped to you in a discreet, plain envelope. Hair club has the solution you want. Call now. The crew of transasias flight may have turned off the wrong emergency before the crash. The plane lost power in the right engine. After assessing the black box data its suspected the pilots may have shut down the left one. Its still unclear why this happened and what it could mean for the investigation. Were joined for more on this. David, what are air crash investigators saying about this . What is indicated if one of the engines was turned off . Yeah certainly some delicate questions being asked. I actually had a chance to meet with the lead investigator into the crash at the accident safety council. Thats the agency thats looking into this. Certainly delicate questions about what the pilots did and did not do. They are being very careful in what they are saying, releasing pretty much factual information from the two black boxes and not specifying what the pilots did. And certainly not saying why delay it. What we did why they did it. What we did learn was interesting details about what happened in the first 30 seconds or first minute of the flight. Thats when the first emergency occurred. Heres what the managing director of the ase told me a short time ago 30 seconds after the aircrafts liftoff, the right engine numbertwo engine went auto failure. For some reason it went auto failer it triggered failure, it triggered master warning in the cockpit. And the pilot said engine flameout. There will be a massive engine number two flameout message to the pilot. And of course the checklist for that. Reporter whats critical about what thomas wong told me is that the pilots the data shows the pilots should have had a visual message explaining which engine had the problem. This is the right engine income number two. What happened right engine engine income two. What happened a turboprop atr72, what normally happens if there is an engine failure is the propeller blades will rotate. What that does is it minimizes drag so that the plane can successfully be flown on one engine. Wong says the engine did not fail but something happened to actually cause that rotation. So they did not have any thrust coming out of the engine. We do know from the information investigators have released that then the other engine the left engine was shut down. The big question linda, is of course why are investigators not shedding any more light on that. Certainly delicate questions in the days ahead. Linda . Of course david, investigators are still searching for some of the passengers missing who have not been recovered, bodies not recovered on the flight. There were some remarkable stories of survival. The miraculous survival of the little boy, the toddler. How is he doing . Reporter 15 survivors including that remarkable story you mentioned. Weve seen the video of the 15 month old boy in his fathers arms. His mother vivian also. The three are in a nearby hospital. We have a little update on his condition. He was in the icu. He was released yesterday on friday. And now the hospital director says little 15monthold has so much energy hes jumping around asking to be held by his mother. His mother has actually a broken wrist or injured wrist. She isnt actually able to hold him. Certainly a good sign though a sort of uplifting tale of survivor amidst all of this. Linda, i should mention the scene going on behind me here in the river. Very much active. The fire chief on site here confirming that they have found four bodies today. That brings the total to 39. Four people still remain unaccounted for. Linda . Thank you very much for the update. Now at this hour, World Leaders are gathering in germany to discuss the escalating violence in ukraine. This follows fridays talk in moscow where the leaders of germany and france met with president vladimir putin. The kremlin says the two began working on a plan to implement prior Peace Agreements. Moscow called the discussion a positive step in the settle. Of the ukrainian crisis. Now to munich germany. Jim has been following the story and has more on this. Firstly, these european leaders who met on friday spoke for four hours. How much talk of there on a Peace Agreement, and whats expected to happen to . Reporter well as you know the previous agreements for peace including the minutes st. Agreement have been nothing. They failed immediately. So its been talk and no action to actually see peace in eastern ukraine. So everybody coming here to munich to if they can sort it out even more. If there is going to be any Serious Movement in the crisis in ukraine, it would happen this weekend in munich because secretary of state john kerry is here. As you say, Angela Merkel is coming. You have the foreign minister lavrov of russia. You have the president pour shank oh of ukraine. Its a unique opportunity just to have these people sitting down with each other throughout this day, sudden to see if there is any kind of hope for a Peace Agreement. So when you see secretary kerry meeting with poroshenko, you see him meeting with lavrov we will be listening carefully for any change in language after their meetings. Of course secretary kerry said on thursday the ball is very much in the court of moscow. We will be listening to mr. Lavrov to see whether there is any kind of idea of a Peace Agreement. One of the interesting thing here of course is that Angela America whole is hosting the conference here in munich germany, has been trying very hard to get a Peace Agreement while mr. Kerry has certainly stepped up the rhetoric and talk about possibly getting defensive military equipment to the ukrainian military. Tough talk there, as well. Some wondering whether the russians are trying to exploit some sort of difference in the western alliance if you will. Were going to be listening carefully to the word today. This munich conference is a security conference. Theres lots going on that has nothing to do with the ukraine. Its more what happens around the edges. These bilaterals, trilaterals that happen very secretly in some of the rooms here. We dont get to listen to what theyre talking about. Language here could be crucial in trying to find a peace settle investment ukraine. Given how quickly russianbacked rebels have advanced in recent weeks, is there any word on how a Peace Agreement would be enforced . Like i understand nato is looking at a plan to establish a Defense Force consisting of some Eastern European nations. Could that be used to defend ukraine . Reporter theyre certainly not talking about using these Defense Forces to yet defend ukraine. I think youre right about the nato secretary talking here yesterday in munich, using strong language. Talking about how terrible things have been in the last year in Eastern Europe and talking about how nato needs to step up. Hes calling for the individual countries within nato to do more. This idea of putting more defensive forces around the area near russia is something that could very well provieke more action from the russians provoke more action from the russians. The nato secretary general says things in a crisis situation. He wants to the nato countries doing more. His language has been very strong here in munich. Okay. Jim in munich thank you very much for the latest. Bobbi kristina daughter of late Singer Whitney Houston remains in the hospital fighting for her life. Now police are shifting the focus of the investigation on to someone close to the music legends daughter. Also, jurors in the murder tropical of a former nfl star leave the courtroom to see where the victims body was found. Investigators are looking at Bobbie Kristina houstons late boyfriend after she ended up facedown in a bathtub. A source close to the family tells cnn that brown has injuries that still need to be explained. The 21yearold was found unresponsive in her atlantaarea home january 31st. Doctors placed her in a medically induced coma. As she continue to fight for her life her grandmother, sissy houston is, by her side at hospital. Her father singer bobby brown, is also in atlanta. The sixth day of testimony has wrapped up in the murder trial of former nfl player Aaron Hernandez. The dayened with the jury going day ended with the jury going on a tour of key spots in the case including the place where the victim lived. Susan cant yachty y Susan Candiotti has the details. Reporter a field trip thats all business. The Aaron Hernandez jury escorted by bus with a police motorcade for an upclose view of evidence that might make it easier to not the case. In court, prosecutors give a preview. Were going to direction your attention to a cell tower thats located in that area. Reporter the jury sees four cell phone towers that prosecutors say generate signals along the route the former patriot tight end takes with odon lloyd the night he is murdered. Next stop outside odon lloyds home. During the jury tour prosecutors point out a Security Camera at the house across the street. It captures this Surveillance Video of lloyd getting into a car investigators say is driven by hernandez. Hernandez is not allowed on this trip. But the jury gets to see the spot where prosecutors say odon lloyds bulletriddled body is found in this industrial park. After about 15 minutes, they head for hernandez neighborhood. The jurys bus tour winding up here at Aaron Hernandez home. Theyre inside right now. Both prosecutors and defe