Grocery Shopper sees a White 50+ male acting strange, called police: Mass Shooting Prevented. (Not a Muslim)

http://www.dailykos.com/stories/2015/12/11/1459319/-Grocery-shopper-alerted-police-to-a-man-s-strange-behavior-and-may-have-stopped-a-mass-shooting?detail=email

Another Good Guy With A Gun who was going to: 'Take back the land'

Police in Edgewater, Maryland were alerted to a man’s strange behavior by a person shopping in a grocery store. Police ended up detaining 56-year-old Kirk Green and upon further investigation, discovered he had apparently been planning an attack:

Officers detained the man, 56-year-old Kirk Green of Edgewater, and later found guns, ammunition and plans to attack government agencies in his vehicle, police said.

Police said Green had circled locations on a map, and a journal was found in which he said he planned to "take back the land.

Green appeared to be delusional and a roommate confirmed his mental illness. Even in custody, he was threatening officers: