It was the latest provocative act involving the Civil War-era symbol since nine black church members were gunned down during Bible study in South Carolina, and it happened in the heart of an area devoted to the slain civil rights leader, near his birthplace, his crypt and a center devoted to preserving his legacy.
Atlanta police Chief George Turner said his agency was working with federal authorities and they have not determined what charges might be levied. Turner said they have not ruled out a hate crime, though Georgia has no state hate crimes law.
The Rev. Raphael Warnock, senior pastor at Ebenezer Baptist Church, called placing the flags on church grounds a "terroristic threat."
King preached at Ebenezer Baptist Church on Auburn Avenue, once a bustling center of commerce for Atlanta's African-American businesses and residents. The area is home to the historic church and a new church building where the congregation now meets and where the flags were placed. Nearby is the Martin Luther King Jr. Center for Nonviolent Social Change, and all of those buildings are just a short walk from the home of King's grandparents, where he lived for the first 12 years of his life.