ukrainian plane. that tweet was later deleted, but that is more evidence cited by ukrainian officials. and just one more thing, this buk system, it's a russian made surface-to-air missile launcher, ukrainian separatists, pro russian separatists kparptd it june 29th, when they captured it, they bragged about it, on twitter. they showed a picture of it in fact. a tweet that showed this missile system and that was more evidence that ukrainian officials cited with their early suspicions that it was exactly this kind of launcher that took this plane down and u.s. officials believe the same. >> we'll wait to hear what the president has to say about this in an hour and 15 minutes. many thanks to you. an emergency session of the