Do a search on “Happy Land dance club fire” and see just how dangerous confined spaces are with someone intent on doing harm.
Here is a link and a few more. No guns involved.
http://en.wikipedia.org/wiki/Los_Angeles_Times_bombing
http://en.wikipedia.org/wiki/Wall_Street_bombing
http://en.wikipedia.org/wiki/Happy_Land_fire
http://en.wikipedia.org/wiki/Oklahoma_City_bombing
http://en.wikipedia.org/wiki/16th_Street_Baptist_Church_bombing
http://en.wikipedia.org/wiki/Cinema_Rex_fire
http://en.wikipedia.org/wiki/Bath_School_disaster
http://en.wikipedia.org/wiki/Richard_Speck
And a mass murder that didnt happen because the bomb went off ahead of time. BILL AYERS friends.
http://en.wikipedia.org/wiki/Greenwich_Village_townhouse_explosion
http://www.discoverthenetworks.org/individualProfile.asp?indid=2169
Ayers then-girlfriend Diana Oughton, along with Weatherman members Terry Robbins and Ted Gold, were killed when a bomb they were constructing exploded unexpectedly. That bomb had been intended for detonation at a dance that was to be attended by hundreds of Army soldiers at Fort Dix, New Jersey. Ayers himself attested that the bomb would have done serious damage, tearing through windows and walls and, yes, people too. Notably, Ayers’ fingerprints were found at the bomb-making site, along with an assortment of anti-personnel weapons, stabbing implements, C-4 plastic explosive, and dozens of Marxist-Leninist publications.