while they wait for aid, padaw and her fellow villagers find ways to keep going. during the attack, her neighbor, youssuf, ran and grabbed one thing he thought necessary to survive. >> ( translated ): i'm making this fishing net, so when the rainy seasons comes, i can fish here. that way, i can get something to eat for myself and even these children here. >> reporter: but it will be weeks until the rains come. in an attempt to feed themselves, the displaced try to sell their other belongings. even that would earn them enough to buy only a few days' worth of food. the u.n. is now warning that 5.5 million people-- half the population of south sudan-- are at risk of severe food insecurity this year. >> this is pbs nrwshour weekend, saturday. >> sreenivasan: more details are emerging about the homegrown terrorist who killed four people near the british parliament this week. saudi officials have confirmed that years before the attack, he taught english in saudi arabia on two different occasions between 2005 and 2009. the british-born convert to islam also visited saudi