Randy Stair, a 24 year old resident of Tuhnkhannock, Pennsylvania went to his workplace at the Weis Supermarket at 12 AM June 8th and barricaded all of the emergency exits with wood pallets, and then proceeded to pick his coworkers off one by one with two sawed off shotguns.
He killed three of his coworkers (The victims were identified as Terry Sterling, 63, of South Montrose; Victoria Brong, 25, of Factoryville; and Brian Hayes, 47, of Springville) and one other escaped, witness account from the one who escaped says she came in to face to face contact with the shooter and he purposefully let her escape. He then killed himself. He was insdpired by the Columbine killers.
This is the video where he goes into detail about how he planned the attack (06:28 on)
http://heavy.com/news/2017/06/randy-...otos-facebook/
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Interesting to see into the mind of someone who would do this and begs the question would he have if he had lived in the UK (ie access to guns)