In a letter to Mayor Cherelle L. Parker, a DOJ official said the investigation will evaluate whether police were violating the Constitution by their method of revoking gun permits.
Prosecutors accused some of their colleagues of filing documents that were "not supported by the record" and said the conviction should actually stand.
A group that called itself "AudiA6" offered to take cryptocurrency from online criminals and "mix" it to try and hide the origins from authorities, prosecutors said.
A judge said he had "no grounds" to keep the case open, as President Donald Trump and the Justice Department had taken steps to reverse criminal consequences for thousands of Jan. 6 defendants.
Jaclyn Mason said supervisors in Krasner's office also encouraged her to lie to a federal judge to try to conceal the way prosecutors had handled the case.
Convicted former Philadelphia labor leader John Dougherty had been arguing for months that he should be released to provide care for his gravely ill wife.
Prosecutors said Ruben Filipe Gabriel Martins tricked victims into giving him account information while he was associated with "the Com," an international cybercrime network.
