After three police officers were acquitted in recent months of charges related to last year's high-profile death of Freddie Gray, prosecutors announced Wednesday they were dropping all charges against the three remaining officers facing trial in connection with Gray's death.

The news was a defeat for Mosby, who had announced the charges against the six officers in May 2015 -- four months after she took the job as the city's top prosecutor.

Still, Mosby struck a defiant tone. Standing at the intersection where police arrested Gray in April 2015 she railed against police officers whom she accused of kneecapping her office's investigation.

Police investigating police is "problematic," she told CNN, citing "the obvious bias consistently exemplified" by some officers throughout the case. Officers who were witnesses were placed on the investigation team, lead detectives were uncooperative, the department launched a "counter-investigation" to disprove her case and officers created notes after the case was launched and gave them to the defense months before they were provided to the state, she alleged.

Baltimore Fraternal Order of Police President Gene Ryan called Mosby's accusations "outrageous" and "simply not true."