CAROLYN THOMPSON and MICHAEL R. SISAK 

BUFFALO, N.Y. (AP) -- The gunman who killed 10 Black people in a racist attack at a Buffalo supermarket has been charged with federal hate crimes that could potentially carry a death penalty.

The filing of the new charges against 18-year-old Payton Gendron on Monday coincided with a visit to Buffalo by Attorney General Merrick Garland.

Garland met with families and laid flowers at a memorial outside the Tops Friendly Market.

Investigators say Gendron's radical, racist worldview and extensive preparation for the May 14 mass shooting are laid out in online documents.

Garland said "families and the survivors will be consulted" as the Justice Department weighs whether to seek capital punishment.

Gendron's lawyer declined to comment.