. >> woodruff: and poet priscilla uppall captures the olympic spirit. >> i just love it because it's really metaphorical. it's very playful. many of the sport terms are basically invented by teenagers and young people. >> wiidruff: that's all ahead on tonight's newshour. major funding for the pbs newshour has been provided by: and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> brown: egypt staged its first air strikes into the sinai peninsula today since its 1973 war with israel, but this time the targets were islamic guerrillas. we begin with a report from john ray of independent television news. ( gunfire ) >> reporter: deadliest clashes in decades along a border upon which the peace of two nations and so much beyond depends. overnight, the egyptian military moved in on militants blamed for a surge in violence that climaxed in a dramatic cross- border raid on sunday. gunmen had already killed 16 egyptian gua

.; a power play in colorado; the growing cyber threat; plus poet priscilla uppall on the olympic spiritws of the day. here's kwame holman. >> reporter: a suicide attack in eastern afghanistan killed three nato troops and an afghan civilian today. two taliban bombers struck in kunar province, an insurgent stronghold on the pakistan border. in all, 15 nato troops have been killed in the afghan fighting so far this august. in the u.s. presidential campaign, the major candidates traded fire today over welfare and health care. republican mitt romney stepped up his accusations that president obama has weakened welfare reforms. romney spoke at a rally in des moines, iowa. >> with a very careful executive action, he removed the requirement of work from welfare. it is wrong to make any change that would make america more of a nation of government dependency. we must restore-- and i will restore-- work into welfare. ( applause ) >> reporter: the obama campaign insisted again that the president simply granted states more flexibility to deal with welfare paperwork. and in denver, the president addr

. >> woodruff: and poet priscilla uppall captures the olympic spirit. >> i just love it because it'seally metaphorical. it's very playful. many of the sport terms are basically invented by teenagers and young people. >> wiidruff: that's all ahead on tonight's newshour. major funding for the pbs newshour has been provided by: