President Joe Biden said "white supremacy is a poison" and vowed "hate will not prevail" during a trip Tuesday to Buffalo, New York, where he grieved with family members of 10 victims killed Saturday during a racially motivated mass shooting at a supermarket. "What happened here is simple, straightforward terrorism," Biden said. "Domestic terrorism inflicted in the service of hate and a vicious thirst for power that defines one group of people being inherently inferior." Biden and first lady Jill Biden met with families of the shooting victims, who ranged from 32 to 86 years old. Most were Black, either shopping or working at a Tops Friendly Market in one of Buffalo's highest concentrated African American neighborhoods. The slain included a civil rights advocate, a deacon and a heroic security guard. The shooting suspect was identified by authorities as Payton Gendron, 18, of Conklin, New York, about 200 miles east of Buffalo. Gendron is white, and law enforcement officials were working to confirm the authenticity of a 180-page document published online before the attack that discusses the "great replacement theory." The document detailed the plot and identified Gendron by name as the gunman, a law enforcement official told The Associated Press. "I call on all Americans to reject the lie and I condemn those who spread the lie for power, political gain and for profit," Biden said, though not singling out any names. "We've now seen too many times the deadly, destructive violence this ideology unleashes." To read more, tap the link in our bio 📸: Andrew Harnik for @apnews