another student, matt walker, posted this video to snapchat as the a couple occurred around him. >> oh my god! [gunshots] >> reporter: another female student posted this to twitter saying locked inside my classroom at douglas high. i cannot fathom my emotions right now. another twitter user named lex says shooter is still on campus, locked inside, no battery, can't respond, i am freaking out. the fbi set up a website to upload pictures and videos in an effort to collect additional information. heather: these students document these firsthand accounts. support pouring in. >> the levees, politicians, around the world, mike pence tweeting our hearts break for all the victims and families affected by the terrible school shooting in broward county, florida. students, teachers, administration and family will remain in our prayers. ivanka posting to twitter, pray for the innocent lives lost in a parkland, florida community in the wake of today's and speakable tragedy, celebrities waited including britney spears, just heard the tragic news about florida, my heart breaks for the students. marjo

and another student matt walker posted this video to snapchat as the unthinkable occurred around him.reams] [gunfire] [bleep] oh my god. oh my god. [rapid gunfire] carley: now a softball player at the high school posted this to twitter saying shooting at school right now. i'm safe in a closet. pray for everyone at douglas. and another student also said. this the swat evacuated us and like three people i know were shot in our building and there was blood everywhere. i can't breathe right now. but i'm safe. horrible. jillian: it is. when you see situations like this playing out over social media. you get a lot of reaction and support from people across the country. carley: people around the world including vice president mike pence our heart breaks by people affected by today's shootings in broward county, florida. students, teachers, administrators and families will all remain in our prayers. senate majority leader mitch mcconnell chiming in i'm deeply saddened by the horrific violence in parkland, florida. always grateful for first responders who charge into harm's way. democratic con

i want to bring in matthew walker, a 17-year-old jr. at un. matt, we're glad you're okay. tell us about your afternoon. >> i was in class. it's the last period of the day. i was just doing my work, kind of near the end of the bell. out of nowhere i hear banging in the hallways. i just thought it was some kid messing around but it got louder and louder. the guy started shooting through like the little window, through the door. it was really loud. there were bullet holes everywhere. everyone was freaking out. >> can i stop you there, matt. could you see the shooter? >> i did not see the shooter but i did -- he did shoot through my class. >> he shot into your classroom. was anybody hit? >> yes, there were kids injured, but he couldn't get inside because the door was locked but he was shooting through the glass. >> could you tell how far away he was from the door? >> i cannot. i cooperauldn't see him. >> about how many shots did he fire into the classroom? >> i'd probably say 10 to 12. a lot. >> those 10 or 12 shots, even though i'm sure it happened quickly, it must have felt