Per CSP Lt. David DelVecchia, Director, Western District Major Crime, Connecticut State Police, lead investigator on the Sandy Hook case:

"After the incident occurred, chaos continued; there was limited parking space as well as limited driving space. This proved to be very problematic; ambulances and patrol cars could not exit or enter the school grounds. People traffic was also an issue. Every agency that could respond, did. A lot of time was lost to identification and verification of people (parents, fire departments, police, police dressed in civilian clothing with weapons) arriving to the scene." (Sandy Hook, Lessons Learned, June 16, 2014)