what does this mean for kim jong-un's commitmentnto denunuclearize the k koren peninsula? we will get reaction from washington. also coming up, the city the islamic state turned into a ghost town. the city in a northern iraq was liberated three years ago but only a fraction of the yazidi minority who once liveved there have returned. we will have a an exclusive report. and a smartphone ban at schools in france. his are outraged, parents are happy, but the t teachers worryt will be tough to enforce. as temperatures soar off the scale, what happens if we just have to carry on work in the relentless heat? we ask the advice of berlin's road builders as we sweat our way througha real heatwave. ♪ brent: i'm brent goff. it's good to have you with us. tonight, reports that north korea has not stopped working to build new ballistic missiles that could carry a nuclear weapon. the washington post says that u.s. spy satellites detected renewed activity at a site that has produced them in the past. this puts into doubt the promise made by north korean leader kim jong-un. at a summit in