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More information at macfound. Org and with the ongoing support of these institutions this program was made possible by the corporation for public broadcasting. And by contributions to your pbs station from viewers like you. Thank you. Woodruff the city of brussels began three days of mourning today. 31 people were killed and 270 others wounded in tuesdays suicide attacks. Today, investigators kept up a manhunt, as the city tried to get back to Something Like normal. Malcolm brabant reports from brussels. Reporter hundreds gathered in brussels place de la bourse this morning to remember the victims of yesterdays twin bombings with a moment of silence. Well i think everyone can agree that this is a horrible, horrible, horrible thing. I think thats all there is left to say about it. Pour moi, je pense. translated i think we had to be here. I dont have the words to express what i feel but its true that we have been used to see these attacks for a long time but when it happens at home, you feel it in a stronger way, you feel more involved. Its the least we could do for the victims. Reporter elsewhere in the city, flags at European Union buildings were lowered to half staff. European leaders laid a wreath at the metro station where one of the bombers struck, and belgiums king and queen visited with staff and Emergency Responders at the Brussels Airport, which announced it will remain closed at least another day. Many others in the belgian capital took pride in returning to work and routine as a sign of strength in the face of terror. Yes, i have to go, we all have to, because otherwise they think they will win. Thats what they want, to paralyze our lives in europe and we have to go on with it. We should not be afraid. I think the most straight answer is to be there. To continue our lives, to go to the terraces, to drink our coffee, to go to the cinema and so on. Reporter but as life went on, so did the search for answers. Investigators now believe at least four individuals were involved in the attacks. They say ibrahim elbakraoui and another unidentified man seen here at the Brussels Airport yesterday were the two suicide bombers who struck the departures concourse. That second man Najim Laachraoui allegedly also made the suicide vests for the paris bombings. And, it was elbakraouis brother, khalid, who blew himself up on a subway car near the European Union complex, about an hour later. The third man, not yet identified from the airport photo, is still being sought. translated the third suspect wearing a light jacket and a hat is on the run. He put down a large bag then left before the explosion. It contained the largest explosive charge. Shortly after the arrival of the bomb disposal unit, this bag blew up because of the highly unstable nature of the explosives. Fortunately, nobody was injured. Reporter Officials Say the two brothers did have criminal records tied to robbery and carjacking, but it wasnt until a march 15 raid on a belgium apartment rented by Khalid El Bakraoui that they became suspects in the ongoing terror probe. That search also turned up fingerprints belonging to Salah Abdeslam the top suspect in novembers terror attacks in paris. He was captured last week. One of several raids since yesterdays attacks turned up explosives and chemicals used to make bombs, as well as ibrahim elbakraouis computer on which he said he was unsure what to do, hunted everywhere, and no longer safe. Today, turkish president Recep Tayyip Erdogan said one of the attackers was deported from turkey in june. translated we informed the Belgium Embassy with a diplomatic note about the deportation on july 14, 2015. Despite our warnings that this person is a foreign fighter, belgium could not establish any links with terrorism. Reporter likewise, french officials have complained that belgium failed to conduct security crackdowns in muslim areas after the paris attacks. French foreign Prime Minister manuel valls called for greater coordination today, before traveling to brussels. translated we closed our eyes everywhere in europe including france to the progression of extremist ideas, neighborhoods which through a combination of Drug Trafficking and radical islamism, perverted youth. And im not here to lecture the belgians, because im sure theyre more than aware of this. Reporter there was also word that secretary of state john kerry will travel to brussels on friday, to meet with top belgian and european officials. And tonight, european and iraqi intelligence officials told the Associated Press that isis has dispatched at least 400 fighters to europe, specifically trained to attack the west. Judy . Woodruff malcolm, given the threat of these fighters, give us the sense of the security across europe. You traveled into belgium today. Reporter yes, ive come from less bowes in greece, and traveled through paris, and all the way you can see how sensitive people are in the wake of these attacks at transport hubs. At athens airport, for example, today, there was an alarm going off, and you could see tension in peoples face because they didnt know what was going on. In paris, the plane was met by policemen checking very assiduously everybodys passports and this is something that should not normally happen in the freetravel own swroen. This is supposed to be paperfree. But they were checking everybodys identities very closely. Indeed, there were sniffer dogs there. Driving into belgium was not a problem. The border was wide open, but on the other side of the motorway, it was very difficult getting out. There were hordes of policemen on the border with france trying to see if they could get hold of those people that might be involved in those attacks yesterday. And when i finally got into the center of belgium, into brussels this morning this afternoon, rather at the euro star station tlooked very much like this was a city at war. There were army trucks everywhere, police guards, and people checking being checked as they went into the euro star station because this is something people really are concerned about. In order to get into these places now, perhaps you need to be checked. And then there was a queue outside. These are the sort of things that can become soft targets in the future. Theres a real difficult about the balance of security in places like the euro star, train station and at airports. Woodruff and just quickly, malcolm, you reported on turkey having deported back to belgium one of the attackers from what happened yesterday. How do belgians explain this . Reporter this is really embarrassing for the belgians because the turkish president said that the belgian authorities were warned that this man did have terrorist links and he said that the belgians had not been able to find any. And yet, this man was able to Wander Around in belgium for months before carrying out this terrible suicide attack, and it really does beg the question about what the european authorities are going to do about people who return from syria, especially as this is where theyre getting the military expertise to be able to carry out the sort of attacks we saw in brussels yesterday. Woodruff Malcolm Brabant reporting for us tonight from brusselss. We th. And we will take a closer look at europes struggle to prevent this sort of attack, after the news summary. Ifill in the days other news, president obama defended his administrations strategy against terror, and dismissed republican calls for more aggressive action. The president spoke in buenos aires, where he met with president mauricio macri. At a news conference, he said fighting the Islamic State group is his number one priority. But he rejected Donald Trumps call for waterboarding, and ted cruzs talk of Major Military strikes. So, when i hear we somebody saying we should carpet bomb iraq or syria, not only is that inhumane, not only is that contrary to our values that would likely be an extraordinary mechanism for isil to recruit more people willing to die and explode bombs in an airport. Ifill mr. Obama also condemned cruzs call for surveillance of muslim neighborhoods. He said it would be wrong and unamerican to make muslims feel ghettoized. Woodruff donald trump was off the campaign trail today, but ted cruz was in new york city, where he fired back at the president. After a rally in manhattan, cruz branded the obama policy a failure, and said americans are fed up with being lectured on islamophobia. We have seen president obamas weakness and appeasement give rise to radical islamic terrorism. Isis, which president obama wrongfully dismissed as the junior varsity, is the face of evil. They have declared jihad on america and president obama refuses to acknowledge that. He is so captured by Political Correctness hes unwilling to confront it. Woodruff also today, cruz picked up the endorsement of former rival jeb bush, after winning tuesdays republican caucuses in utah. But donald trump won the arizona primary, to pad his delegate lead. On the democratic side, Hillary Clinton won arizona, and Bernie Sanders won caucuses in utah and idaho. Well hear some of clintons speech on Foreign Policy today, and have an interview with senator sanders later in the program. Ifill House Speaker paul ryan decried the state of politics and the president ial campaign today, in a washington speech. The Wisconsin Republican named no names, but his remarks appeared pointed directly at frontrunner donald trump. This has always been a tough business. And when passions flare, ugliness is sometimes inevitable. But we shouldnt accept ugliness as the norm we should demand better from ourselves. We should demand better from one another. We are slipping into being a divisive country. We are speaking to each other in echo chambers where we only talk to those who agree with us and we think that there is something wrong with the people who dont agree with us. Ifill ryan has said he will back the eventual republican president ial nominee. Woodruff theres word that most of the warring parties in yemen have agreed to a cease fire, as of april 10. A special u. N. Envoy says it involves the government and its sunni backers including saudi arabia plus shiite rebels. Meanwhile, local officials confirm that a u. S. Air strike killed some 50 militants at an alqaeda training camp, west of the port city of mukalla, on tuesday. Ifill an independent task force in michigan blasted state officials today for mishandling the water contamination crisis in flint. The group was appointed by republican Governor Rick Snyder last year. It found the state is fundamentally accountable for letting lead taint the citys water and then, ignoring pleas from the public. Woodruff a son of billionaire Warren Buffett has unveiled a 90 million fund to help young girls of color. In the u. S. The foundation, run by peter and jennifer buffett, says its the largest single investment of its kind. The first step will be to survey minority girls and their advocates to determine how best to use the money. Ifill on wall street, a new drop in oil and other commodities pulled stocks down. The Dow Jones Industrial average lost nearly 80 points to close just above 17,500. The nasdaq fell more than 50 points, and the s p 500 slipped 13. Woodruff and former Major League Baseball catcher and popular broadcaster Joe Garagiola has died. He played eight seasons in the majors, but was known for his 57year, halloffame broadcasting career. Garagiola worked well into his 80s, serving as a parttime analyst for the arizona diamondbacks. He was 90 years old. Still to come on the newshour europes struggle to combat terror; Bernie Sanders on his view of americas role in the world; arguments over covering contraception before the Supreme Court, and much more. Ifill we return to the attacks in brussels, and what they said about the threat of the Islamic State to europe. Daniel benjamin was coordinator for counterterrorism at the state department during the first term of the Obama Administration hes now a professor at dartmouth college; and joby warrick is a National Security correspondent at the washington post. Hes also the author of black flags the rise of isis. Ifill Daniel Benjamin, was this a nightmare scenario that could have been foreseen . Yesterday, we heard people saying this is what we feared. I think people have been watching terrorism have been fearing this for many years, actually. The recognition that europe had a problem with extremism in its midst and the recognition that europe hadnt taken security arrangements as seriously as it should have, i think has been common, that observe has been common in the Security Community for many years now. Ifill joby warrick, the Associated Press, among others, have been reporting today that there were as many as 400 people being trained by isis to carry out these attacks in europe. So did they not leave and foot prints or any signs . The numbers a little bit soft, i think, but its not unrealistic to think if you have 5,000 europeans that went to iraq and syria to fight, if only 10 of them came back home, you know, thats a pretty good base for future attacks. You know, abiewrkd the guy that carried out the november attacks in paris, claimed there were 90 people that he knew of involved in cells getting ready to carry out attacks. So its not something that can be easily dismissed. Ifill from what you know about writing your book on isis, is this the sort of thing the United States should be wary of . Are there footprints as well leading here . Its a different situation for us. Fortunately, we dont have the kind of radical communities you see in europe. We have radicalized individuals but not so much a community problem. And we have, fortinally, oceans separating us from some of these jihadists. Europeans have a much more acute problem. Theyre really waking up to it now. Its almost too late for some of the action theyre taking because the threat is at hand. Ifill you agree the idea of alienation makes it different for the radical muslim communities in europe and here . Theres no question theres a higher level of alienation and radicalization. European muslims are several times more likely to go to fight in iraq and syria, perhaps as much as 10 times as much. And if you look at the just the casualties that weve seen since 9 11, you know, theres been vastly more violence in europe, 10 times as much, at least, compared to the United States, where, despite all the concern, weve only had about 45 casualties, 45 deaths, due to jihadist violence. Ifill so is it Law Enforcement that is dropping the ball in europe . Its a much larger problem than Law Enforcement. You have a very different kind of set of muslim communities. They tend to be much poorer, much less educated. They have much less social mobility, much less access to education and even lespolitical remgz. Its a societal problem. Its important to note a large majority of european muslims are very, very peaceful and love their countries. In fact, when polls are taken, they tend to be more patriotic than the nonmuslim populations. But because of these conditions, it is easier for a smaller number of extremists, still much larger than we have in the u. S. , to swim in the same seas, if you will. Ifill well, joby warrick, Daniel Benjamin mentions that there are only 45 casualties since 2004, including madrid and paris no, no, im sorry in europe you have had closer to 500. Ifill 500. In the United States youve had 45. Ifill the other way around, thats right. So making the point thank you that there are that many people and that many signs, is this something that is operating so far under the radar that belgian authorities or your poll, or french authorities couldnt have had a heads up about it, i just want to add, especially since president erdogan of turkey today saying he made a warning . Yeah, i think the belgians, in particular, have a problem and theyre very aware of it. And were often saying these days youre only as strong as your weakest link. In the case of belgian, you have a country with a fairly small police force. If they have, by conservative estimates, about 100 isis veterans have returned to that country alone, so the manpower involved in conducting surveillance