The allegation reignited anger in the St Louis suburb of Ferguson, with the 18-year-old student's family accusing police of character assassination even as the investigation into his death continues.
Incident reports from the Ferguson police department linked Brown by name to the theft of a USD 49 box of cigars from a convenience store, just minutes before he was shot in broad daylight on a nearby street.
Police released surveillance footage showing a tall, muscular black man -- in a T-shirt, khaki shorts and sandals, the same outfit Brown was wearing -- grabbing a store clerk by the shirt and shoving him.
The disclosures followed Ferguson's first night of calm this week, after Missouri Governor Jay Nixon yesterday ordered state troopers to take over from heavily-armed and distrusted local police.
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"Last night was a great night," said Captain Ron Johnson of the Missouri State Highway Patrol, the African-American officer put in charge of restoring order and who became an instant hero for meeting protesters in person overnight.
But the connection was made in an incident report, dated Saturday, that summarized the content of surveillance video from inside the unidentified corner shop that was allegedly robbed.
"The video reveals Brown enter (sic) the store" with his friend Dorian Johnson and engaging in "an apparent struggle confrontation" with a store clerk, before exiting with a box of Swisher Sweet cigars.
"It is worth mentioning that this incident is related to another incident (in which) Brown was fatally wounded involving an officer of this department," the report added.