Maggie, you are citing an old NBC report that NBC apologized for later on that day and after the state police held a ME news conference in which they said that the “long weapon” was found in the school and was used to kill everyone but the shooter.
And there is this press release from the state police yesterday:
http://www.ct.gov/despp/cwp/view.asp?Q=517284&A=4226
I updated the post with the link to yesterday’s release. Thanks!