The dismissals began Friday night, according to two people cited by The Associated Press. An email sent by one of the fired inspectors general said "roughly 17" inspectors general had been removed.
The watchdog's reporting comes in the wake of several high-profile deaths in federal lockups in recent years, most notably the murder James "Whitey" Bulger and the suicide of Jeffrey Epstein.
The Justice Department on Friday outlined a broad new push to support crime victims, including coordinating with state and local authorities in cases where federal charges won't be brought.
The report found the U.S. Park Police made the call to clear Lafayette Park before knowing of then-President Donald Trump's visit to a damaged church in the area.
House Democrats accused the president of trying to protect Secretary of State Mike Pompeo from investigation by firing the State Department inspector general, Steve Linick.
President Trump removed the head of a group charged with overseeing the Coronavirus package passed by Congress. Trump has bristled at the oversight actions of several inspectors general.
The State Department's inspector general released a report concluding that Trump officials demoted a national security expert over her Iranian roots and the perception that she was disloyal to Trump.
The federal agency "did not do an adequate job of protecting" the government's interest, according to a report by the GPO's Office of the Inspector General that NPR has obtained.