LOUISVILLE, Ky. (AP) — Louisville officials have now asked the U.S. Justice Department and the FBI to review the police department’s internal investigation of the killing of a black woman by officers raiding her home two months ago.

Louisville Mayor Greg Fischer and Louisville Metro Police Chief Steve Conrad announced their request for additional federal help on Thursday.

The police review is going to the state’s attorney general since the county’s prosecutor, Thomas Wine, recused himself from the case, a statement by the mayor’s office said.

A lawyer for Walker said he fired in self-defense because the officers did not announce themselves, a point disputed by Louisville police.

Kendall Boyd, the director of the Louisville Metro Human Relations Commission, said city officials have put together an initiative, the Synergy Project, to have constructive dialogues about the “strained” and “broken” historical relationship between police and communities of color.