WASHINGTON (AFP) - The beleaguered US city of Chicago, struggling to rebuild trust with its citizens following a police shooting scandal, on Friday released video and other materials from more than 100 active investigations of police conduct.

The city said the trove of videos, audio recordings and written reports, represent the totality of all open cases by the Independent Police Review Authority (IPRA), the city's investigative body in charge of police oversight.

But Sharon Fairley, the head of IPRA, cautioned at a Friday press conference that the materials being released may not convey all the facts in each case.

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"I urge you to please keep this in mind," she told the gathered news media.

A majority of the cases are labelled "firearm discharge," meaning an officer-involved shooting.

IPRA has faced criticism for being too slow to act on police abuse allegations, including in the case of Laquan McDonald.

The 17-year-old was shot and killed by a Chicago police officer who is now charged with first-degree murder. Charges were not filed until more than a year after the incident.

"We all agree that there is a lack of trust and that increased transparency is essential to rebuilding that trust," Fairley said.

Among the cases in Friday's materials release was that of Darius Pinex, who was shot and killed by two officers who mistook his car for a different one involved in a shooting.

Earlier this year, a federal judge accused a city lawyer of hiding evidence in the case, including a recording with a police dispatcher which contradicted the officers' version of events.

Another video shows a police officer opening fire as he is charged by a shirtless Ismael Jamison.

Jamison survived the shooting and was later sentenced to nine years in prison for attacking a bus driver prior to the officer's arrival on the scene.