New evidence is giving clues as to what happened aboard egyptair flight 804 just moments before it crashed into the Mediterranean Sea. Cnn has learn smoke alerts went off shortly before the plane disappeared from radar. Searchers have as found debris and human remains in the sea. But we still dont know what caused that plane to crash on thursday. There was 66 people on board. Egyptian officials expect terrorism but no group has come forward to claim responsibility. Lets get the latest from Cnn International correspondent arwa damon live at cairos international airport. Arwa, what more are you hearing about this investigation at this point . Reporter well, george, the details that are coming to lighting are really serving mostly to add to the mystery surrounding what the cause of this possible crash may be. You do have these various different smoke alarms that were set off, that arent even necessarily definitively indicative of any sort of fire breaking out. But could also have been set out by the plane come ago part. Basically, all of all of its Warning Systems would have possibly gone on the fritz as it was colliding towards the Mediterranean Sea. All this is really proving agent this point is that there was some sort of crash. This is basically what we have known all along but we dont really know at this stage any sort of new Information Agency to whether or not this was some sort of catastrophic technical malfunction. Or an act of terrorism. All thats happening is a severe amount of speculation around the various different causes that could have led to this horrific event that led to the loss of life of 66 people. 56 of them passengers. And then seven crew members, plus three security officers. The egyptian authorities have managed to recover a bit more debris. And by that, i mean small items such as luggage seats. And then, of course, sadly, more human remains. The families of those who perished in this incident are still struggling. Still trying to come to term with what happened. Understandably, so, of course. Trying to come to grips not only with their emotions but tools their frustration to a certain degree, anger over the fact that there hasnt been any Significant Developments when it comes to why this plane went down. Of course that kind of information can be and generally is hard to come by in circumstances like these ones. Because the chunks of wreckage that are needed to try to extract concrete answers are in the Mediterranean Sea at this stage. And their specific location has not yet been pinpointed. Although we do have a better idea of where that wreckage may be. So theres very scant concrete information at this stage, george. Oh, one can only imagine the grief that these families have right now. So few answers. And were in the middle of a process now, as this airline starts to notify next of kin. Can you talk to us about that process . Reporter well, its a very difficult one. Because not only do these various different, and its hard to even talk about it, human remains need to be identified, theyre going to have to be going through a fairly length process of proper identification of identity. And of course, hanning those over to the various different relatives and nationalities. About 30 were egyptian nationals, about another 15, french. And the rest were from all Different Countries. And add into all of that, a lot of the remains have yet to be recovered. So for the families who are waiting there is very little closure. Incidentally, our ian lee went to one of the mosques yesterday where there were friday prayers being held for the dead. And in some cases even friday prayers being held for the missing. And some family members didnt attend and they didnt attend because they didnt want to accept that their loved ones were dead. Were gone. Its a very difficult process for anyone to have to go through this. But to go through the loss of a loved one and not have closure, that is even more unbearable on some level. Given the fact that this is still a search and rescue. You can imagine families holding out hope not wanting to go to that Prayer Service. Arwa damon live for us, thank you for your reporting. Lets talk more now about these four major possibilities that investigators are considering in this crash. First, a smuggled bomb. The early theory among u. S. Officials is terrorism. But they caution as that as based on circumstances, and not concrete evidence. Scenario two, an Insider Threat did terrorists recruit an airport employee to sabotage the plane on the ground . Scenario three, was it a technical issue. Or scenario four, pilots or some other action. Experts say all of these are plausible and it can be key to providing research on the crash. We have captain desmond ross from the dealt ae investigation, live from istanbul. Dr. Ross, with your extensive expertise in the Aviation Industry id like to get your reaction to these sirchdifferen scenarios. The first that i mentioned, a smuggled bomb, plausible . Yes, plausible. Airport employees in those areas can be radicalized and very well paid. And money goes a long way. The second scenario that the plane was somehow sabotaged on the ground. Is this something that we should be talking amore when it comes to security at the airports . Absolutely. I cringe when people bring up a thing like a pilot crashing an air draft. An engineer is perfectly able of crashing an aircraft by leaving a bolt undone or hitting a pipe thats not correctly placed. Theres all sort of employees, engineers, cabin attendants, not just pilots. Theres a lot of people out there that have a direct effect on the directional capabilities of any aircraft that applies. Lets talk about this possibility of a technical problem. Especially given the new information that weve learned. What are your thoughts . Its look, egyptair, i think, is actually quite a respectable airline as far as their maintenance and so forth. Ive not heard any criticism of their maintenance. This aircraft of 2003, thats not really that old. Its a very reliable aircraft. The airbus 8020, and its a plausible scenario, still, engines, weve seen it recently, a brand new a380 blew up a couple years ago. It happens but its rare. I would rate that as one of the lower possibilities. Okay. And then the other scenario that we mentioned to our viewers, pilot error. When youre flying at high altitude, and 37,000 is quite high, but its not that high. I mean, you can go a lot higher up at 45 and whatever, theyre critical factors in controlling an aircraft. Very critical speed bands and angle of attack which some fully understand. But youre going into an area of very thin area and the aircraft has to be handled quite accurate. Thats why autopilots are used. Normally, a pilot doesnt handle an aircraft at that altitude. If something goes wrong, it requires very special training. I dont know that these pilots were trained. We can get into hours of methods of Pilot Training these days compared to when i did it it and some of my colleagues did. And i want to get your thoughts. Again, we dont really have any concrete information. We have just bits an points of data that were all trying to assess. When you talk about the descent here from 37,000 feet down to 15,000, down to 10,000, does that sound to you like it could have been a controlled decent. Or does that sound to you like a plane out of control . My initial reaction was was not a controlled descent. It looked like it was out of control essentially. And hearing about the smoke alarms and fire warning, which, frankly, im a little cautious about. Were hearing about them all morning, and weve seen transcripts but has anyone actually really confirmed that these are accurate . So youre questioning the accuracy . Well im just wondering about it. I havent been told and i have no evidence in front of me to say this was a genuine did from the acars system transmitting from that aircraft. I hope it is. Id hate for this to be a red herring. I dont think it was a controlled descent staat all. The left hand and then the spirals righthand is not something youd do. It ended up in a crash. The only plausible explanation, with the pilots it headed down immediately so the depressurization in the cabin didnt cause problems for passengers you need to be able to breathe. And you cant do that at 37,000 feet. That would have been the only plausible reason he would have been headed down and that would have been exacerbated by smoke in the cabin. Im feeling at the moment, these smoke alarms, its all true, its all isolated. It wasnt in the lavatory or something else, it was in the whole airplane. That sounded like it was a fire or something exploding, it was bad. Captain can desmond ross, we appreciate your insight. Again, we dont have any concrete information but again different points of data that were trying to assess here. And we appreciate your experience and knowledge in the field to help us do that. We wont have anything final until the investigation is proven on a track. And parts are recovered and examined. And hopefully, the flight data recorder is recover fairly quickly. Captain ross, thank you for your time today. When it comes to the search area, weather conditions have cooperated so far. But that could change in the hours to come. Our meteorologist derek van dam is following this at the International Important service. And george, it will likely change within the next 12 to 24 hours. Heres the latest satellite trajectory. Cairo and the Eastern Mediterranean and the general search thats taking play. We have a cold front coming, cloud cover as you saw on the satellite a moment ago. Its not really the rain that im concerned about, its the strong winds that are going to wrap in behind this particular front. And that will have, obviously, an impact on the waves and sea conditions as the search and rescue operations move forward. Now, take a look at this. This is wind gusts. You can see the legend at the top portion of your screen, were talking wind gusts monday morning into tuesday. In excess of 50 to 70 Kilometers Per Hour. Roughly, 40 to 50 Miles Per Hour. We have the potential to see open ocean swells anywhere between one to three meters. This causes concern for any of the vessels taking part in the search and rescue operations. Not to mention the strong winds impacting helicopters and aircrafts across this region. Now, its not only the weather but the ocean currents that we have to consider as a factor for the displacement of the possible debris field that theyre searching for extensively at the moment. This is the mediterranean ocean currents. These circular patterns are called eddies, spinning ocean currents found all over the world. Not only in the mediterranean, but in the indian ocean as well as the atlantic. Just to prove what im talking about. This is the potential of an oil slick that was spotted by a satellite. That is about 40 kilometers away from the last known communication position with the plane. Now, taking you below the surface of the water, this is a relatively flat seafloor. When you compare this to perhaps mh370 over the indian ocean a year ago, they had to scour mountains and crevices and it made it it a tad easier for the search forces to find the all important black box. George. Good to know that, derek. The difference that we saw with mh hchlh 370. Thank you so much. French Airport Security is under scrutiny after the egypt aircraft. Why some airport workers there lost security clearances over the past year, when we come back. Plus, families share stories of some of those lost on board the plane. 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Common side effects are dizziness, sleepiness, weight gain and swelling of hands, legs, and feet. Dont drink alcohol while taking lyrica. Dont drive or use machinery until you know how lyrica affects you. Those who have had a drug or alcohol problem may be more likely to misuse lyrica. Now i have less diabetic nerve pain. And these feet would like to keep the beat going. Ask your doctor about lyrica. Welcome back. The crash of egyptair flight 804 has people speculating that trim may have been a cause. But airport Charles De Gaulle has come under scrutiny. Since early this year, dozens of security have lost security clearances. Security is indeed ramping up at that airport as france is taking any threat of terrorism quite seriously, especially since its capital was the target of terror attacks last year. For more on whats happening, lets bring in cnns jim bitter mann in the nations capital. To screen people, what has been done and what is being done . Reporter well, george, theyre going over the recordings of anybody that came in contact with the egyptair jet. In fact, theyre been looking at cttv cameras, the baggage handlers, security folks and all of that sort of thing. That is a process that began almost immediately after it was confirmed that 804 had crashed. Even before its known what brought down egypt err 804 security questions have been raised about its last departure. Charles de gaulle airport. In that time, could someone have placed a bomb aboard, perhaps sitting in baggage or a food service cart. Or could a terrorism managed to board with other passengers. Questions have been raised in part because of last years bloody terrorist attacks in france. In their aftermath, interior Ministry Officials revealed that 85 security badges needed to access secure areas of the airport were revoked last year because the badge holderers allegedly showed signs of radicalization. Whats for, Airport Security carried out a new sweep of employees again looking for anybody who might pose a threat. But 86,000 people work at the airport and screening for signs of radicalism is a daunting task. None the the, in the wake of the egyptair crash without knowing the cause, officials ordered a thorough investigation of anyone who might have come in contact with the plane and a review of video. This is not only a necessity by measures this is nor a judgment nor assumption but its a failure its a way to protect you as we always have done to make sure our citizens are safe. Reporter in fact, officials from the president on down are trying to reassure everyone in the traveling public that security is their highest concern. Since the egyptair crash its been announced that more have been added to security personnel. Translator the government strengthened all of its measures. Everything is being done to reinforce everywhere. Reporter but the French Foreign minister has also said theres no such thing as zero risk. The egyptair crash has put the spotlight on security here in a very awkward time. In the next two months, the country will host the tennis championship, the european soccer championships and the Tour De France bicycle race. Events that will attract millions of people many who will travel through the same airport. The impact on those events could be devastating. So, george, while the idea of security caused security flaw brought the plane down, theyre still going to continue out here at the airport with the inspections of the cct footage with the idea that it probably cant hurt but might help. Jim bittermann reporting live in paris. Thank you. Flight data shows stops in tunisia and air trayia. Jeffrey thomas of airline. Com explained the situations. If it turns out that there was a bomb on board that aircraft, then theyll obviously be looking at the first flight of the day which is from cairo to the return flight. Now a bureau of. M r Diplomatic Security said in the United States said that unpredictable levels of security. While the British Government warns that tunisia is the most dangerous area for britons to travel to. And we may call that last year we had the terrible tragedy where 31 britons were massacred at the beachside resort. So, both theories have serious question marks in the security level at the country and also at their airports. And were also starting to hear from some of the relatives of the 66 people who were on board that plane. They are working with very few answers this day, and as you can imagine coping with great loss. Heres cnns Miguel Marquez with this story. Reporter the crushing reality setting in. Their loved ones, gone. We were at a press conference, he said. They said nothing. Some people just collapsed then left. At cairos el al sadique mosque, a painful gathering of friends and family an uncle of the planes copilot Mohamed Mamdouh assem. He does want to get married. He is in any relationship, he does introduce me to his reporter ten crew member, 55 passengers, two of them infants. Today, their loved ones in shock, inconsolable, mara hari, a devoted and loving mother, always there to offer a helping hand with a pure smile. Richard os morning a geologist working in egypt. The 40yearold leaves behind two infant daughters. He was just a very admirable person. A lot of people admire him for his strength and walls. Reporter pascal, almost didnt make the flight. He was headed to egypt to visit his sick father, he was said to be always smiling. The family of the head Flight Attendant on 804 says she was just starting a new life. She was a newlywed who got married six or seven months ago, she says. I asked god for the flight to be hijacked instead of what weve been told. We have hope. With d