i'm tyler matheson with this special news update.is hour, thousands of israeli troops are conducting a ground assault in the gaza, sharply escalating a tense ten days in the region. prime minister benjamin netanyahu says the aim is to destroy weapons and rockets hamas has been amassing, as well as tunnels burrowed under the border. reporters say there is heavy artillery fire from ground troops and israeli naval vessels off the coast. israeli cabinet has drafted 18,000 reservists. >> the other major story, investigators are combing through the wreckage of malaisian air flight 17. the boeing 777 traveling from amsterdam to cokuala lumpur was shot down. they are using satellite images to determine whether the missile was launched by separatists in ukraine or russian forces. all 295 onboard were killed. both stories sent stocks tumbling today. cnbc will have a special report at the top of the hour. michelle cruisa cabrera will join me and i hope you will, too. a cabrera will join me and i hope you will, too. r cabr me and i hope you will

." >> and i'm tyler matheson it is although busy day. there you hear and see the images and hear the sounds of gunfire. despied the grown invasion, hamas has fired 80 rockets into israel just today. captured an additional 13. in his first comments, israel's permit said the operation may need to be expanded. u.s. investigators are on the way to ukraine to investigate the downing of malaysian airlines flights 17. there you see image. it is unclear yet who fired the missiles, but u.s. sources it almost almost certainly came from -- almost a third of those kid were aids researchers. president obama spoke about 30 minutes ago. >> i spoke to president putin yesterday in the wage of additional stageses. he said he wasn't happen with them. i told him that we have been very clear from the outset so far they have yesterday to take that path. >> president obama also confirming one passenger aboard was an american. sue? dom any chu is here on the floor of the nyse. morgan brennan is uptown at the nasdaq. i'm impressed by the fact that the market is