Gov. Kathy Hochul called out the alleged shooter in a Tops supermarket mass shooting that left 10 dead Saturday as a "coward" and "white supremacist," speaking to the congregation of True Bethel Baptist Church at a service Sunday morning.

Thirteen people were shot by 18-year-old Payton Gendron, of Conklin, New York, at the Tops on Jefferson Avenue around 2:30 p.m. Saturday afternoon. Officials are investigating the incident as racially-motivated hate crime. 

Hochul described the incident as "personal" to her family, a a native of Western New York, and reaffirmed her stance on mitigating gun violence on New York streets while pointing some responsibility for the radical spread of hate speech and racially-motivated crime to social media platforms.

"Yes, I am the governor of New York. But I am also a daughter of this community, and the first governor who is a mother. We must do something about this. I am saying to the instruments of this evil - the social media platforms that allowed this hate to spread like a virus around this world - this was not a random act of violence. This is in a league of its own," said Hochul in an empassioned speech Sunday. "You've attacked people for the color of the skin, because you are a coward, and I want to silence those voices now."

Hochul issued that the "eyes of the nation" are on Buffalo, saying that she hopes to see the community on its feet, working to rebuild and recover from the heartbreaking shooting.

"I want them to talk about Buffalo as the last place this ever happened. An attack on one of us is an attack on all of us because we are all God's people and I will use every bit of the power I have as your governor to protect you," said Hochul.

"I want to be clear," she continued. "This was a calculated execution of individuals based on the color of their skin. That is not our speculation. Those are the direct words of the accused, who will be brought to justice."

Hochul says New York leaders must focus on mitigating "dangerous and unchecked" radicialization and white supremacy online, as well as reinforcing gun laws, saying that the weapon used in the shooting falls outside strict New York gun law. The governor says its origin is under investigation. 

New York State Attorney General Letitia James also attended the service, saying in part, "We've got to demand change, we've got to demand justice. This was domestic terrorism, plain and simple, and it should be prosecuted as such. [The shooter] was fed, each and every day, a steady diet of hate and for that he should be held accountable. We need to come together to address gun violence in our community and gun violence in general. We need to come together to have a conversation about hate." 

The attorney general announced last year that she, and a coalition of other AG's throughout the nation, have launched an investigation into the negative impacts of social media, specifically Facebook and Instagram platforms, on young adults. She mentioned her study in a press conference following the service, saying that she plans to continue cracking down on how social media moguls "profit over protect." 

Buffalo Mayor Byron Brown called the shooter a "racist, hateful gunman" at the service and encouraged healing at the service. 

"True Bethel community, let's hug each other and family a little tighter. Let's love on each other. Let's grieve and let that heaviness go because we have to continue to build this community. The eyes of this nation, the eyes of the world, are watching us. Let's show them what Buffalo is made of and out of this terrible tragedy, let's make it a triumph," said Brown. 

Following remarks from lawmakers, members of the congregation and officials could be seen hugging and comforting one another in the aisles. 

Sunday's service was also attended by Buffalo Common Council President Darius Pridgen, Congressman Brian Higgins, State Senator Tim Kennedy, and other county leaders. U.S. Senator Chuck Schumer also appeared via Skype Sunday, saying he believed in the community's ability to rise above the violence.