sudanese information minister canceled an interview with jane ferguson, to respond to charges against government. tomorrow, jane reports on the famine that the war has caused. >> brangham: stay with us, coming up on the newshour: a weekend chock-full of politics kicks off a busy week on capitol hill. our politics monday duo breaks it all down. and a behind-the-scenes look at one of the world's fastest growing social media networks. but first, a new investigative report finds a disturbing pattern. sexual abuse of students by other students happens more frequently in schools than reported. and the consequences for the offenders vary considerably. jeffrey brown has the story. >> brown: "a hidden horror educators have long been warned not to ignore." that's the description of sexual abuse in schools by the associated press, which published its story today. a.p. reporters found that students were seven times more likely than adults to sexually assault another student. during a four year period, the a.p. tallied at least 17,000 cases around the country. these included many cases that were t

for the pbs newshour, i'm jane ferguson, in juba, south sudan. >> woodruff: tomorrow, our focus on southan continues with a look at what life is like for refugees fleeing the violence into neighboring uganda. >> woodruff: stay with us. coming up on the newshour: is mountaintop mining sacrificing coal country's environment? and, how facebook has beat its competitors by copying their ideas. but first, sometimes searching for the truth is dangerous work. journalists around the world at times risk death or imprisonment to inform the public. 24 years ago, the u.n. general assembly proclaimed may 3rd "press freedom day," so we mark this moment by assessing where things stand. william brangham has the story. >> brangham: it's often where you report that determines the level of threat a journalist faces: in mexico, dozens have been killed by cartels while reporting on the drug trade; in turkey, it's the government that's been cracking down, closing newspapers and locking up reporters. and here in the u.s., it's a rhetorical attack, with accusations of fake news, and the president questioning the

again in partnership with the pulitzer center on crisis reporting, special correspondent jane ferguson reports. >> reporter: she studies with focus and poise. rebecca looks like a typical student next to her classmates in thoahnom school, in a remote area of south sudan, but few of them have been through what she has endured. her family fled for their lives when government soldiers raided their village. they survived by hiding in swamps for two weeks. >> ( translated ): when we fled our village, we were 28 people, when we got here, we were 24. two were shot and two died of hunger. >> reporter: one of those who died was her 13-year-old sister. rebecca watched her grow weak and starve to death. >> ( translated ): we didn't have anything to dig with to bury her, so we just put grass on the body and left it there. >> reporter: marcoe nur is 16 years old and also goes to school here. two months ago, he made it to this village with what remained of his family. >> ( translated ): when we fled the fighting, i saw at least 20 people killed. along the road, later, people died of hunger. >> repor

tomorrow, "the newshour" begins airing a three-part series on the crisis from special correspondent jane ferguson, who looks into the reports of ethnic cleansing by government soldiers. i saw many people killed including my brother. they called pie brother to come out of the house and shot him in front of me. >> the u.n. said in december in a statement, south sudan is on the brink of all out genocide and yet its peace keepers seem unwilling or unable to stop it. last year government soldiers forced their way into the camp, and over several days murdered more than 25 people, and injured and raped many others. >> sreenivasan: finally, florida congresswoman ileana ros- lehtinen announced that she plans to retire. she is the first hispanic woman and first cuban-american ever elected to the house of representatives. the republican won her seat in 1989 and later became the first woman to chair a standing committee, the house committee on foreign affairs. the havana-born ros-lehtinen came to miami when she was eight and didn't speak english. the 64-year-old lawmaker says," it's time to take a new step."