The Department of Homeland Security has developed a new resource for preparing for and responding to emergency situations in church buildings. The Guide for Developing High-Quality Emergency Operations Plans for Houses of Worship was released in June.
It includes information on developing response plans for natural disasters, and it also has a section on responding to “active shooter” situations. DHS also has a webinar, Conducting Security Assessments: A Guide for Schools and Houses of Worship.
See also the InterConnections article from April 2013, Planning for Emergencies and the Unthinkable.