The Federal Bureau of Investigations has obtained an audio recording that allegedly captures 18-year-old Michael Brown’s fatal shooting at the hands of Ferguson, Missouri police officer Darren Wilson, CNN reported on Monday.

CNN mentioned that it has not independently verified the recording, which was given to the bureau by a Ferguson resident. In the audio, the unidentified man can be heard telling someone, “You’re so pretty” while 11 gunshots are heard in the distance — seven in one burst, then a pause, followed by four more shots.

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“He was in his apartment, talking to a friend on a video chat,” the man’s attorney, Lopa Blumenthal, told CNN. “He heard loud noises and at the time, he didn’t ven realize the import of what he was hearing until afterwards, and it just happened to have captured 12 seconds of what transpired outside of his building.”

Wilson shot and killed Brown on Aug. 9, setting off a series of protests in the community and around the country criticizing police-involved shootings. A lawyer for Brown’s family said an autopsy revealed that Brown was shot six times during the encounter.

Several witnesses have come forward saying Wilson shot Brown after the younger man ran away from Wilson following an altercation during a traffic stop.

Ferguson police have argued that Brown tried to get into Wilson’s patrol vehicle. Wilson has yet to be arrested in connection with the shooting, which has angered demonstrators and critics of the department.

Watch CNN’s report, as aired on Monday, below.