the spotlight from his republican opponent. the gop front-runner won't be at the final debate before the iowa caucuses because of his ongoing feud with fox news. the standoff between armed protesters and federal authorities intensifies i oregon. three more members of the group are arrested, while others remain on the disputed wildlife refuge. a crash landing is caught on camera. a helicopter pilot and his student somehow walk away when their chopper falls from the sky. good morning from the studio 57 newsroom at cbs news headquarters in new york. good to be with you. i'm anne-marie green. tonight, republican president schaap candidates hold their last debate before monday's iowa caucuses but the focus who won't be taking part. donald trump locked in an

says he is still boycotting the debate. >> reporter: with the debate just hours away, donald trump is still refusing to attend. a point he made clear wednesday night in an appearance on fox news. >> will you just consider? i want you to consider, all right? think about it. >> bill, this is much tougher being with you, because, franklin, frankly, you're smarter. this is much tougher than doing the debate with megyn kelly, trust me. >> reporter: at an event in south carolina earlier, trump continued to take aim at the fox news host moderating the event. while in des moines, chief rival ted cruz once again challenged him one-on-one. >> i'm going to propose a venue. western iowa, saturday night, sioux city. we already have it reserved. >> reporter: while his opponents are on the debate stage, trump

even those who don't support the outspoken candidate are excited what they are calling the anti-debate event. >> you know, as an american citizen, it worries me if he is unable to stand up to one reporter or one moderator, how he is going to attempt to make america great again. >> reporter: trump's camp says he'll hold a veterans affair on campus tonight. at least one iraq, the iraq and afghanistan veterans of america said they will decline donations from the event. marlie hall, cbs news, des moines, iowa. clinton is pushing the democratic national committee to add the debate but the dnc says it's sticking to its schedule. bernie sanders' campaign says he'll participate in another pre-new hampshire debate if clinton agrees to three more debatesater this year.

occupying a federal wildlife refuge in oregon surrendered to authorities late yesterday and apparently heeded the advice of the leader ammon bundy who urged his followers to go home. last night a vigil was held for robert lavoy finicum. he was killed when they were arrested at a traffic stop. one protest says finicum charged at the officers. the militants have occupied the refuge three weeks now. it's estimated that three dozen armed protesters may still be there. meanwhile, bundy made his first court appearance. danielle nottingham reports. >> reporter: ammon bundy and several of his followers are charged with a felony offense of conspiracy to impede officers from discharging their official duties through the force, intimidation, or threat. >> these individuals have chosen

america they profess to love. >> reporter: the judge ruled the eight militia members were a flight risk and ordered them to remain in custody until a second hearing on friday. they were arrested tuesday night when fbi agents and police intercepted them on an oregon highway. bundy's brother ryan was shot and the militia spokesman, 55-year-old lavoy finicum was killed. they say finicum was shot several times on the ground. >> what kind of a human being is that? they walk up and shot them. that is the kind of people we are tired of dealing with. >> reporter: they are occupied the malheur wildlife refuge since february 2nd to appeal land policies. >> we work through the appropriate channels. this can't happen any more. >> reporter: many in the area want bundy's group to leave. >> i've been ready for them to leave for -- for several weeks. >> reporter: federal agents have

the refuge where the remaining armed occupier are refusing to end the siege. danielle nottingham, cbs news. the world health organization meet in a special session to discuss the zika virus that has spread to the americas and caribbeans and africa. thousands have been affected and the u.n. agency is pressured to take action. don champion is here in new york with more. >> reporter: no treatment or cure for the virus. the hunt for the vaccine is but to could years. steps are being taken in the u.s. to prepare and stop the potential spread of the virus. the virus is spread by mosquitoes. so far, it has not been found in any in the u.s., but there have been cases in this country of people who had traveled to infected regions. during warmer months, the mosquitoes that carry the

where 60% of americans live affecting 200 million people. the virus is apparently linked to a birth defect which causes babies to be born with smaller heads. it first came to the attention of health officials in brazil where there are thousands of suspected cases, but only 270 have been confirmed. doctors in this country are preparing for the likely arrival of the virus. >> out of five women, only one exhibits symptoms, so the other four don't have symptoms and may still have been exposed and may still develop micro incefhaly in their fetus. we think that is high. >> reporter: the centers for disease control has told women not to travel to countries affected by the zika virus. both united and americanairlines are allowing pregnant women to postpone travel or receive refunds for flights to affected

>> even some of the countries we were considering that weren't on the travel ban list, i thought by the time of our trip in march, it seemed like the list was rapidly growing. >> reporter: now, it's still not known how common zika infections are in pregnant women and more research is needed in the link between the virus and birth defects. about 80% of people who get the zika virus have no symptoms and makes it difficult for pregnant women or anyone else to know if they have been infected. >> thank you, don champion in new york. we will hear from the government's top infectious disease expert on what is being done to stop the zika virus coming up on "cbs this morning." three dangerous inmates who escaped from a california jail are still on the run but five people who may have been involved are under arrest. none are jail employees. but had some connection to the inmates. the inmates escaped from the orange county jail friday after cutting a hole in a metal grate, crawling onto the roof and

rope made of bed sheets. a potentially dangerous situation at miami international airport when a drone crossed the flight path of an americanairlines jet. police searched the airport perimeter, but came up empty. the jet was traveling from chicago wednesday morning. the crew did not take evasive action and the jet landed safely. duke university has partially lifted a ban on sorority activities imposed. u.s. official implemented the ban after a sorority member was hospitalized on tuesday night and listed in critical condition. the student is expected to make a full recovery. coming up on the "morning news." a nanny found murdered. a 25-year-old american woman in

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here's a look at today's forecast in some cities around the country. u.s. customs agents seized aas many as 40,000 knock-off hoverboards in a shipment from china. the boxes containing the potentially dangerous boards are held at a warehouse near o'hare, airport. even authentic hoverboards have problems. dozens have burst into flames.

down in a long island neighborhood when its engine failed. tracey koroko of our cbs station has the dramatic video. >> how did you manage in like the most perfect place? how did you not hit those wires? >> because i saw them. >> dude, geez. how long have you been flying? >> two years. >> reporter: confident words from pilot joseph lombardo as the video shows the inside of his helicopter after a crash landing in the middle of a neighborhood around noon. >> i looked to my left and i see the helicopter right next to me and i thought i was seeing things. i saw it go behind the trees and under the power lines and tip right over. >> reporter: explosive surveillance video shows when the helicopter of the experienced 26-year-old pilot and his first time student falls out of the sky. residents heard the failing engine overhead. >>s all of a sudden, the puttering got worse and i watched the propellers actually stop. i saw the man's face in fear. and i started going like, just land!

>> reporter: air traffic controllers knew the chopper was in trouble from this may day transmission. lombardo managed to land the chopper in the intersection, avoiding any homes, electric wires, or passing cars below. miraculously he and the student walked away without injury. remarkably only this street sign was clipped during the accident. right now the fa and ntsb are investigating exactly what happened here. >> that was tracy korosko

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