Buffalo shooting suspect had visited in early March, police say

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(CNN) — The 18-year-old White man accused of killing 10 people in a racist mass shooting Saturday at a supermarket in Buffalo, New York, had visited in early March, police commissioner Joseph Gramaglia said Monday.

Officials had previously said the suspect, who is from Conklin, about 200 miles away, arrived in Buffalo on Friday for the first time to scout out the Tops Friendly Markets store in a predominantly Black neighborhood. However, Gramaglia updated that timeline as he described the investigation into the suspect's extensive "digital footprint."

The information comes as investigators have dug into a 180-page diatribe posted online and attributed to the suspected gunman that lays out in detail his motives and plans for the attack.

The massacre follows other mass shootings in recent years in which authorities say a White supremacist suspect was motivated by racial hatred, including in El Paso, Texas, Charleston, South Carolina, and as far as Norway and New Zealand.

The suspect, Payton S. Gendron, pleaded not guilty Saturday night to a charge of first-degree murder. More charges are expected. He is in custody without bail and under suicide watch, officials said.

Gendron allegedly traveled to the grocery store because of its presence in a heavily Black neighborhood, authorities said. He wore tactical gear for protection and livestreamed the attack on Twitch, authorities said. The company said it took down the video within minutes, but social media sites have struggled to stop its spread.

Inside and outside the store, he allegedly used an assault rifle to kill ten people and wound three more, one of whom remained hospitalized Monday morning. Eleven victims were Black, officials said, and the attack is being investigated as a hate crime.

After the shooting, he exited the building and surrendered to police. Police said Monday he had plans to kill more Black people if police hadn't arrived.

"There was evidence that was uncovered that he had plans, had he gotten out of here, to continue his rampage and continue shooting people," Gramaglia told CNN. "He'd even spoken about possibly going to another store."

It "appears" the suspect planned to kill more Black people, Erie County District Attorney John Flynn said, adding, "we need to drill down further."

Those slain range in age from 20 to 86, police said, among them the former police officer who tried to stop the gunman and a number of people doing their regular weekend grocery shopping.

Buffalo Mayor Byron Brown on Monday praised the guard's heroism, as well as the quick police response.

"Many more people would probably have been killed and injured if the Buffalo Police did not get to the scene as quickly," Brown said. "They were able to subdue the gunman, they were able to take him into custody without incident and protect the surrounding neighborhood."

Suspect allegedly wrote 180 pages outlining beliefs

Since the shooting, officials have looked at what they say was the suspect's racist intent and his history.

"We continue to investigate this case as a hate crime, a federal hate crime, and as a crime perpetrated by a racially motivated, violent extremist," Stephen Belongia, special agent in charge of the FBI Buffalo field office, said Sunday at a news conference.

The 180-page document attributed to Gendron and posted online before the shooting lays out the alleged shooter's motives and shows the meticulous planning that went into the massacre. CNN independently obtained the document shortly after the mass shooting -- before authorities released the name of the suspect -- and law enforcement sources have told CNN its description of guns matches the weapons the suspect used.

In it, the suspect allegedly detailed how he had been radicalized by reading the online message board 4chan and described himself as a White supremacist, fascist and anti-Semite. He subscribed to a "great replacement" theory, or the false belief that White Americans are being "replaced" by people of other races. Once a fringe idea, replacement theory has recently become a talking point for Fox News' host Tucker Carlson as well as other prominent conservatives.

The suspect also wrote he was inspired by the 2019 mass killing at two mosques in Christchurch, New Zealand, in which the gunman similarly wrote a lengthy document and livestreamed the attack.

The Buffalo suspect wrote he began seriously planning the attack in January. The document's author also writes that he targeted this Buffalo neighborhood because it's in a ZIP code that "has the highest Black percentage that is close enough to where I live."

Indeed, the ZIP code that includes the store, 14208, is 78% Black, the highest percentage of Black population of any ZIP code in upstate New York, according to the US Census Bureau's 2020 American Community Survey. The shooting suspect is from the town of Conklin, New York, a three-and-a-half-hour drive from Buffalo near the Pennsylvania border.

The document also states the suspect bought the main gun he used, a Bushmaster XM-15, from a gun store before "illegally modifying it."

"We are obviously going through (the document) with a fine-toothed comb and reviewing that for all evidence," prosecutor Flynn told CNN.

Suspect made 'ominous' threat last year

A year ago, the suspect landed on the radar of police as a student at Susquehanna Valley High School, officials said.

He made an "ominous" reference to murder-suicide through a virtual learning platform in June, the Susquehanna Valley Central School District said Monday. Though the threat was not specific and did not involve other students, the instructor immediately informed an administrator who escalated the matter to New York State Police, a spokesperson told CNN, adding the law limits what more school officials can say.

Concern arose after the suspect turned in a high school project about murder-suicides, leading to a state police investigation, said Garcia, the sheriff.

"The state police arrived at his house at that point last year," he said. "He stayed at a facility -- I'm not sure if it was a hospital or a mental health facility -- for a day and a half."

State police investigated an unnamed 17-year-old student who had made "a threatening statement" in June at the high school, they confirmed. The student was taken into custody and to a hospital for a mental health evaluation.

It was not the sort of involuntary commitment that would have precluded the suspect from purchasing a weapon, state police spokesperson Beau Duffy said.

This story was first published on CNN.com, "Buffalo shooting suspect had visited in early March, police say."