Some resources that may be of help:

Dealing with trauma

http://www.helpguide.org/mental/disaster_recovery_trauma_stress_coping.htm

NYCore's help sheet put together after Newtown

http://nycore-teaching.wikispaces.com/Talking+%26+Teaching+about+Newtown%2C+CT

A thoughtful reaction after a rushed misreport on suspects

http://thelangarhall.com/news/prayers-for-boston-for-an-end-to-racist-backlash/