p>>> a new isis video threatens pmark zuckerberg and jack dorsey, pthe head of twitter. pisis says it's responding to panti-terror efforts by the two ptech giants. pdestruction. ptornadoes killing at least four eople in virginia while nearly pa foot of wind and snow cause pflight cancellations and pimpassable roads in the midwest. p>>> looking at today's weather, pdry and warming up in the west. psnow showers around the great plakes. pmostly dry in the east and deep pdown in the south it looks like pit's going to be kind of nice. p>> not bad at awe. pcount down to sunday night's poscars we take a glimpse behind pthe scenes. p>> and when it all comes down to pit it revolves around what's in pthe envelope. pbrandi hitt. p>> reporter: they are the best psecret keepers in hollywood. pmartha ruiz and brian cohen set pto carry those famous pbriefcases. p>> and the oscar goes to -- p>> reporter: holding the names. phas there ever been a mistake. p>> no. p>> reporter: price waterhouse pcoopers has counted the oscar pballots. p6,261 sent out on paper and ponline. p>> we control e

p>>> a new isis video threatens pthe lives of facebook founder pmark zuckerberg and jack dorsey, pthe head of twitter. pisis says it's responding to pefforts by the two tech giants pto delete posts and that incite pviolence and promote terrorism. p>> a small colorado town is pdeputy killed in a shoot-out. pdied while carrying out a high prisk eviction. p>> and planemaker airbus is pconsidering replacing at least psome of its seats with benches. pthe company's patent application psays the seats would be designed pfor larger passengers as well as pchildren. pthose are some of our top pstories on this thursday, pfebruary 25th. p>> announcer: from abc news, pthis is "world news now." p>> good morning. pwe're going to start this half phour with the extreme weather pthat is rocking much of the pnation from the midwest right to phere, the east coast. p>> this morning, virginia is punder a state of emergency after ptornadoes left at least four eople dead and dozens more pinjured. pabc's linzie janis has details. p>> reporter: those pdeadly storms barrelling up the peast coast. p>> a tornado j