02/28/2012 05:08 pm ET Updated Apr 29, 2012

School Shootings And PTSD: Trauma Can Last For Months Or Years

Many students wrestle with guilt about whether they could have stopped the shooting or done more to save a friend or peer. In her research of the Santee, Calif., shooting that left two students dead and 13 wounded, Brymer discovered that about 40 students had information about possible threats before the shooting occured. Those people needed extra support, she said.

Read more on MSNBC