Handling the delegate selection process. And mark shields and david brooks are here, to analyze the weeks news. All that and more, on tonights pbs newshour. Major funding for the pbs newshour has been provided by moving our economy for 160 years. Bnsf, the engine that connects us. Fathom travel Carnival Corporations small ship line. Offering sevenday cruises to three cities in cuba. Exploring the culture, cuisine and Historic Sites through its people. More at fathom. Org. Lincoln financial committed to helping you take charge of your financial future. Genentech. Supporting social entrepreneurs and their solutions to the worlds most pressing problems skollfoundation. Org. The ford foundation. Working with visionaries on the frontlines of social change worldwide. And with the ongoing support of these institutions and friends of the newshour. 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 a u. S. Attack on a Charity Hospital in afghanistan that left 42 people dead did not constitute a war crime. That is according to a pentagon investigation which determined the october strike was unintentional, and the result of human error and equipment failures. 16 u. S. Service members were disciplined, but none will face criminal charges. We will delve deeper into the findings right after this news summary. Republican president ial hopeful john yang begins our coverage. Reporter a melee today, as protesters and Police Clashed outside the hotel hosting the California Republican partys convention. The scheduled speaker frontrunner donald trump. Because of the commotion, the candidate had to take the long way in. That was not the easiest entrance ive ever made. My wife called, she said there are helicopters following you, and i went under a fence and through a fence oh, boy, it felt like i was crossing the border, actually. Reporter its his second straight day in the state, and the second day marred by protests. 17 people were arrested at his rally last night in orange county. Live from the heartland reporter from hotly contested indiana, the states top republican, governor mike pence, told radio listeners who won his coveted endorsement. Im not against anybody, but i will be voting for ted cruz in the upcoming republican primary. I see ted cruz as a principled conservative whos dedicated his career to advocating the reagan agenda. And im pleased to support him. Reporter the texas senator is banking on a good showing in the hoosier state. And we have a choice. Do we want to get behind a campaign this is a based on yelling and screaming and cursing and insults. Or do we want to unite behind a positive Campaign Based on real solutions. applause reporter democrat Bernie Sanders is also hoping for a good result in indiana. Today he had tough words for a major employer in indianapolis, its nowshuttered factory providing the backdrop today, we are sending a very loud and clear message to the c. E. O. Of United Technologies stop the greed, stop destroying the middle class in america, respect your workers, respect the american people. Reporter sanders, though, is still the underdog for the nomination, trailing Hillary Clinton by about 300 pledged delegates; by 800 if you count superdelegates. Clinton ended her twoday break from the public eye in new york city, talking race and education given the right circumstances, given the appropriate adult involvement and attention, every child can succeed. And we have got to believe that, and we have got to invest in that. Reporter in 2008, clinton beat thensenator obama in the indiana primary. For the pbs newshour, im john yang. Woodruff well take a closer look at the president ial race, including the key role the individual delegates will play in selecting a nominee, later in the program. In syria, fresh violence rocked the wartorn city of aleppo today. Insurgents shelled a mosque in a governmentheld neighborhood, killing at least 15 people. Meanwhile, new air raids hit rebelcontrolled areas of aleppo, while the death toll from wednesdays strike on a hospital rose to 50. All that, as the u. S. And russia tried to reinforce a ceasefire in a damascus suburb, and the port city of latakia. We want to focus on strengthening the cessation of hostilities, renewing it, reaffirming it, so that we can quell the fighting or the violations, the ongoing violations in these areas. Were fully aware of that aleppo is a trouble spot. But were starting here. Woodruff violence in and around aleppo has claimed the lives of more than 200 people in the last eight days alone. North Koreas Supreme Court has sentenced a koreanamerican businessman to ten years of hard labor, for spying and stealing state secrets. Kim dong chul appeared today in court in pyongyang. He was handcuffed and could be seen wiping away tears. Kim is the second american imprisoned by north korea this year. The u. S. Reported its first zika virusrelated death today. The centers for Disease Control and prevention said a 70year old man in puerto rico died from complications from the mosquito borne virus. The u. S. Territory has at least 683 confirmed zika cases. 65 of those are pregnant women. Vice President Biden visited the vatican today, and called for a global commitment to the fight against cancer. His appearance was part of the vaticans conference on regenerative medicine. The Vice President met pope francis, and in his speech urged philanthropists, corporations, and governments to increase Cancer Research funding. As we stand on the cusp of unprecedented scientific and technological change of amazing discoveries that were once unimaginable breakthroughs, we cannot forget that real lives and real people are at the heart and reason for all that we do. Woodruff the Vice President s eldest son died of brain cancer last year. Months later, mr. Biden declared a moonshot to cure cancer, when he announced he wouldnt run for president. The eurozone has bounced back to prerecession levels after an eightyear financial crisis. Its economy unexpectedly doubled in the first three months of this year. Meanwhile on wall street, stocks fell after the u. S. Economy recorded its slowest pace of growth in two years. The Dow Jones Industrial average lost 57 points to close at 17,773. The nasdaq fell nearly 30 points, and the s p 500 dropped ten. For the week, both the dow and the s p 500 lost more than a percent. The nasdaq fell nearly 3 . And a treasure trove of ancient roman coins has been unearthed in southern spain. Construction workers made the discovery while laying pipes in a small town outside seville. The 1,300 pounds of bronze and silvercoated coins had been stored in clay jugs. Archeologists say the coins date back to the late 4th century, when romans ruled the region. translated we had already seen coins like this, but what is incredible is a discovery of this dimension. There are 19 jugs full. I can assure you that the jugs cannot be lifted by one person because of their weight and the quantity of the coins inside. So now what we have to do is begin to understand the historical and archaeological context of this discovery. Woodruff researchers believe the coins had been stored away to pay for soldiers or civil servants. Images of emperors constantine and maximian were on the coins no women, of course. Still to come on the newshour a deeper look into the u. S. Bombing of an afghan hospital; selecting the delegates who will hold the keys to the president ial nomination; mark shields and david brooks delve into this weeks news, and much more. Woodruff it was an American Bombing of an afghan hospital that killed dozens last year. Today, the pentagon released a 3,000page investigation into the attack and the major mistakes that led to it. Hari sreenivasan has the story. Sreenivasan the pentagon laid out the key findings of its full investigation today, as well as the fallout affecting 16 Service Members. Head of u. S. Central command general joeseph votel the investigation concluded that certain personnel failed to comply with the rules of engagement in the law of armed conflict. Sreenivasan the bombing of the Doctors Without Borders hospital last october in kunduz, afghanistan killed 42 people. Of the 16 Service Members who were punished, one was a two star general and some were specials ops forces. They face adminstrative actions, but votel maintained their actions did not constitute a war crime. The label war crimes is typically reserved for intentional acts intentionally targeting civilians or intentionally targeting protected objects or locations. The investigation found that the incident resulted from a combination of unintentional human errors, process errors and equipment failures, and that none of the personnel knew they were striking a hospital. Sreenivasan even though they didnt know they were hitting a hospital, the investigation found they made multiple fundamental and fatal errors. For example, the ac130 gunships targeting system became misaligned after its crew attempted to avoid fire over kunduz. That resulted in their target appearing as an empty field, instead of a building filled with taliban fighters firing on afghan troops. The crew then switched its focus to the hospital, thinking it was the original target based on descriptions relayed from special forces on the ground. So the aircraft is looking at one location, the ground force is thinking, theyre looking at another location. Theres no way to visually confirm that back and forth between them and their discussions as you look at the transcripts, dont add clarity to that. Sreenivasan officials from Doctors Without Borders called it an insufficient explanation. In a statement, the groups president wrote todays briefing amounts to an admission of an uncontrolled military operation in a densely populated urban area, during which u. S. Forces failed to follow the basic laws of war. The organization pressed for an independent investigation. They pulled out of kunduz entirely after the attack in october. Sreenivasan for more on the militarys investigation and the mistakes that were made, we turn to veteran pentagon correspondent jamie mcintyre. Hes now with the Washington Examiner and an occasional special correspondent for the newshour. When we firstni started rezo q 9 the storynrnr whenpi happene4n october, the narrative was that u. S. Or Afghan Forces were under attack and that this airxd cover was there in almost axlinib. de capacity but the report paints a different picture. Thats right. Thisxi;x of, hari, because unlike ioo irr routinely helping forces onnr t operations, in afghanistan, thats not supposed to be the case. Combat officially ended in afghanistan at the end of 2014, so u. S. Airstrikes are limited to just three very specific instances protecting u. S. Troops on the ground, going after remnants of al quaida, and protecting afghan force ifs theyre in danger of being overrun and slaughtered. Now, the commander on the ground said he did this because his forces were under fire. But what the report shows is they were nowhere near thisni building. ni they werent taking fire. In fact, he called in the airstrike in order to help Afghan Forces whonini. Launch a raid on anr government heldni up. So this tragic accident which has a whole series of factors involved never would haveznvu ground had not exceeded his authority in calling in that airstrikeco which was essentialy to soften the target sonr afghai forces couldcoii6bni mount an. Thats not something u. S. Xdconrs supposedlwonini were doing. Sreenivasan all right, so lets talk about the series of errors that led to this tragedy. Usest, doc has said, listen, we tell everyone in the battle theater exactly where ournicoo[ locati. The msk< it looks like thisni flightxdcok off without dh with. Yeah, there is no question this was axdnin was onni a no but as in any accident or mishap like, this there is a whole series of things that go wrong. You interrupt that chain at any point, the bad thing doesnt happen. This started when thexdcynkconi0 gunship took offc toni help u. S. Troops on the ground. Turned out they didnt have to. They were on their way back. Because of that, they took off early, did not have thew3q nostrike list loaded into theid plane. They also were then threatened m the groukq divert their course. Their radio antenna and satellite radio didntco work, o they couldnt get updatednr information. As you said in your report, when they came back, they were atco y them to an empty field, then]be . Identifyxd the target visually n the ground based on the description they had and theynj simply confused the Hospital Building for this government compound that was about a quarter a mile away. Once they thought that was the tar they were locked on to it and they began really n withering e from the airnh half an hour. And thico is basedn description theyre getting from someone whos on the ground not next to the hospital or next to where the fighting allegedly was happening but several kilometers away. Yeah, they were 9 kilometers away. Normally, you have to have eyes on the target. There is somebody on the ground called a joint tactical air controller, essentially a spotter spotting the target. Theyre supposed to have eyes on the target. nn. What the reportxdcu had eyes on the target, not the afghans, not the americans. Ofnico course,ninid8 the crew e didnt either. This, by thecw way,xdn is fearsome weapon, thiscocoe ac1 gunship, it hasnyni a series on circles the target and rains shells down on the target. It can realiyoom donii] damagea target ld thats what happenedi here. Sreenivasan jamie, even in this report, there still seems to be a discrepancy in how long this attack took place. ni thekzn government hasni one numi and how manyn was circling u the doctors doctors folks in the beginning had a different number. They said it was about an hour and a half. And by the way, they were making desperate calls to the u. S. nr lon7 know, callt offnjroknixd thatnr. The pentagonni today admittednr thoseni calls, as you might expect, went through some layers message was passedni toni groun commanders. According to theni investigation, once they determined that was happening, the information was relayed to the plane crewnikn n in;si hbi shooting. N theres a discrepancy aboutnie borders had putnrozoutxdni]7iin investigation, their own account of what happened based on the eyewitness reports of the people on the ground and, really,xdn just anx65 this very terrible tragedy that happened in the very Early Morning hours of the day. Sreenivasan nioom finally, lt talk about whats happening there were no criminalxd charges here. Why and what happens tocook ther people . Well, they decided not to Court Martial anyone because theynrco decided this wasni an8 unintentional act. Everyco steu]ultniu i were trying to do theayj cvonr thing, they just made some very, very terrible mistakes. Now,nr theninrok people involves gotni reprimands, some of them t ordered to do training. That in a military is a serious thing. They refer to that asp careerending letter of reprimand because once you get one of these in your file youre not going to be promoted. In the military, if youre notnk promoted, you havenco to leave,d many will end upxgrc military. ne c cdc one thing, theyre not sending out any planes without preloading the information that has the nostrikei] list. You might think they had been doing that all along but they werent. Theyre trying to makenigob surs kind of thing doesnt happen again. Sreenivasan washingtoncu thanks soco lwchioo woodruff after donald trump swept the primaries in five northeastern states this week, the frontrunner edged even closer to that magic number of delegates weve all heard so much about 1,237 are needed to secure the nomination. His opponents are redoubling their efforts to keep trump for reaching that number, which would make this the first contested convention in four decades. If that happens, its the delegates the actual people in those seats at in cleveland who will play a makeorbreak role in selecting the nominee. John yang takes a look at how all this is playing out behind the scenes in a key state virginia. Reporter its a friday afternoon in the woods of southern virginia. Theres a heaping helping of smoked shad, country music, and politics. Its the 68th annual shad planking festival a virginia tradition thats part cookout, part political gathering. This year, its a key stop for republicans who want to be delegates to the National Convention in cleveland. Ive been very vocal about my support for ted cruz. I believe that he is the clear constitutional conservative. Party unity is critical right now. We need to coalesce behind mr. Trump and win in november. The virginia one was just a great win. Reporter donald trump won the virginia primary on march 1, but that was just the first step in selecting the States Convention delegates. Winning the primary gave trump 17 delegates one more than marco rubio. Ted cruz came away with eight delegates; kasich got five. Under state party rules, thats how the virginia delegation will vote on the first ballot at the cleveland convention. But and this is key if nobody gets that 1,237 on the first ballot, virginias delegates, like most of the delegates from the other states, become free agents able to vote for whomever they want. What you are seeing in virginia looks a lot like what you are seeing in a number of other states, where the Donald Trump Campaign may have won the primary, but when it comes time to go through the integral process of delegate selection, it looks like ted cruz is doing a lot better. Reporter Stephen Farnsworth is a political scientist at the university of mary washington. He says voting for trump on a second ballot or a third, or even a fourth would be a tough sell for many virginia delegates. A lot of the truly committed republicans believe that donald trump is not the best standard bearer for the Republican