As Buffalo residents expressed horror, anger and grief Sunday over a mass shooting that left 10 people dead at a grocery store in a predominantly Black neighborhood, local and federal officials said they were investigating the attack by a young white gunman as a hate crime and an act of “racially motivated violent extremism.”

       Law enforcement officials on Sunday at the scene of a mass shooting at a grocery store in Buffalo.

       (Kent Nishimura / Los Angeles Times)

       Jeanne LeGall and Claudia Carballada embrace on Sunday as they pay their respects at a makeshift memorial.

       (Kent Nishimura / Los Angeles Times)

       Mourners form a prayer circle Sunday at the site of a mass shooting in Buffalo, N.Y.

       (Kent Nishimura / Los Angeles Times)

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       Aaron Jordan adds to a sidewalk-chalk mural depicting the names of the people killed in the mass shooting at a grocery store in Buffalo.

       (Kent Nishimura / Los Angeles Times)

       Yanilka Faneyte pays her respects at a memorial at the site of Buffalo’s mass shooting.

       (Kent Nishimura / Los Angeles Times)

       Mourners embrace at a makeshift memorial for the 10 people killed at a Buffalo grocery store.

       (Kent Nishimura / Los Angeles Times)

       People pray at the scene of a mass shooting at a grocery store in Buffalo.

       (Kent Nishimura / Los Angeles Times)

       Timothy Kujawski lights candles at a makeshift memorial as people gather at the scene of Buffalo’s mass shooting.

       (Kent Nishimura / Los Angeles Times)