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jason carol has the story. >> reporter: students and faculty had little time to react.al on slot of gunfire ran for cover and reached out to loved ones. caitlyn was at work yesterday when her younger sister, hannah. tested in a panic. there's a shooter on campus i am not joking. call 911 please. hannah, what? are you serious? run. i'm not joking. they just shot through the wall. someone in many i class is injured. i'm not joking call mom and dad. the next message was to her parents. in case she didn't make it. i'm so scared. tell them i love them so much. i know, you're going to be fine. she texted about a wounded classmate. they got shot. like eight minutes ago when the shooting started. it happened in a first floor classroom. hannah survived. and so did a jr. who was grazed by a bullet. while hiding in the same classroom. this morning they received a terrible news about their injured classmate. >> unfortunately she didn't make it. >> some who survived hid behind chairs in the auditorium. or in closets. many tried to keep as quiet as possible. all while texting emergen

jason carol is with me. i understand three people have been sent to the hospital. what's nypd saying? >> first the headline from the police department says the substance was nonhazardous. >> nonhazardous. >> that's just coming to us within the past ten minutes or so. let me backtrack and just review what happened. it was about 10:00 this morning. donald trump, jr. lives on the upper east side with his wife vanessa. she was opening the mail, saw an envelope addressed to him. she opened it. white powdered substance comes out. alarm bells go off. she's taken to the hospital along with two others as a precaution. she didn't have an immediate reaction to opening that envelope and seeing the powder. again, as a precaution, she's taken to the hospital. two others taken to the hospital. decontamination efforts were under way in the area where she opened the envelope. the secret service is alerted, the white house is alerted. those things happened, but the nypd now saying that substance -- the white powdered substance, suspicious in the beginning, now nonhazardous. >> still