( CNN ) -- Residents of Newtown , Connecticut , took to social media Friday to share their fear , shock and horror over the shootings at Sandy Hook Elementary School . Several people on Twitter expressed concerns about relatives who attend or work at the school , where a law-enforcement official said at least 18 children were slain after gunfire erupted Friday morning . Others posted images from the scene and from a nearby fire station , where survivors were taken . A hospital in nearby Danbury posted a Facebook update late Friday morning saying that three victims were being treated there . In what now seems like a much more innocent time , the school hosted a winter concert Thursday . Principal Dawn Hochsprung , who was killed in the shootings , had posted a photo on Twitter Wednesday of a rehearsal for the concert . . If you have trouble viewing this page , please visit Storify to see the post . Do you live in the Newtown area or know people at Sandy Hook Elementary ? Share your views in the comments area below or post your thoughts on CNN iReport . CNN 's Brandon Griggs contributed to this report .
Members of the greater Newtown , Connecticut community react to Friday 's school shootings . Some have relatives who attend or work at the school . People on Twitter posted images from the scene and from a nearby fire station .