After Florida shooting, students spurred to act against guns

When the gunshots rang out at her Florida high school, Lorena Sanabria hid in a classroom with friends, forced to listen to the blood-curdling screams of victims as they waited for help and prayed they wouldn't be next.Now Lorena, 16, is among a new wave of survivors determined to add their uniquely powerful voices to the cause of gun control, which has failed to make headway despite the alarming frequency of such attacks in the United States.Seventeen perished and more than a dozen were wounded