Fifty years ago Sunday, a Ku Klux Klan bomb at a Baptist church in Birmingham, Ala., killed four black girls and sent shock waves throughout the country.
In Birmingham, the tragedy laid bare a deep rift.
Carolyn McKinstry, standing on the sidewalk outside 16th Street Baptist Church, remembers arriving for worship 50 years ago.
"It was Youth Day," she says. "We were excited because that meant we got to do everything. We sang, we ushered, we did everything."
Some of her Sunday school classmates had gone to the ladies' room to freshen up.