GRESHAM, Ore. (AP) — City officials say Gresham Police Chief Robin Sells retired on Friday, effective immediately. The city of Gresham announced the retirement in a news release. The suburban Portland police chief’s retirement comes after a report released last week showed Sells fostered and permitted a hostile workplace that drove out a Black senior official hired to address issues of racial bias. The city didn’t say if the report findings led to the resignation. The report showed a culture of dysfunction and found that members of the police department defied initiatives to improve racial sensitivity within its ranks. The chief said Friday she was not quitting voluntarily, but because of how the city handled the outside investigation.