An online document obtained by ABC News appears to chronicle how Payton Gendron carefully planned out his attack at least two months before he allegedly shot and killed 10 people at a Tops Friendly Market in Buffalo, according to law enforcement sources.
According to the document, Gendron, on March 8, drove to Buffalo and visited the supermarket, where he was questioned by a security guard at the store as he was compiling detailed plans of the location.
The 589-page document, which is separate from the 180-page hate-filled screed Gendron is alleged to have posted online just before the massacre, includes sketches of the supermarket, including the makeup of different aisles, with notes on how to navigate around quickly.
