LOS ANGELES (CBSLA.com) — Chris Brown called the LA District Attorney “racist” in a Twitter posting late Thursday.

The tweet came just days after Brown was ordered to perform an additional 1,000 hours of community service/labor following his guilty plea to a 2009 assault on Rihanna, his on and off again girlfriend.

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In the tweet, Brown wrote, he’d already “done 6 months community service wit(h) police and the DA racist ass crying to the judge that I didn’t do it. (Expletive deleted) the SYSTEM!”

It was unclear whether Brown was referring to District Attorney Jackie Lacey, who released a statement in February that said Brown had failed to provide “credible, competent or verifiable evidence” that he completed the required 180 days of community labor, or the prosecutor who handled the case, Mary Murray.

Brown and Lacey are black, and Murray is white.

The Los Angeles County District Attorney’s Office said there would be no response to Brown’s tweet.

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Last Friday, Los Angeles Superior Court Judge James R. Brandlin told the 24-year-old R&B singer that he can perform the newly ordered community labor in one of four programs — Caltrans highway clean-up, beach clean-up, graffiti removal or a program run by the county’s probation department.

The judge reinstated Brown’s probation after he was charged with a pair of misdemeanors and an infraction stemming from a May 21 traffic crash in Toluca Lake. Those charges have since been dismissed, despite a city prosecutor’s objection.

Prosecutors also filed papers six months ago, questioning whether Brown had completed his community labor hours. They cited “significant discrepancies” in work reports in his native Virginia. The discrepancies were “at best sloppy documentation and at worst fraudulent reporting,” according to the court papers.

Brown’s attorney, Mark Geragos, wrote in a court filing that prosecutors “chose to ignore the actual evidence in an effort to find someone, anyone, to say he was not working.”

“They also chose to ignore their own reports from numerous people who not only saw him working, but saw him working tough manual labor,” Geragos wrote. Brown’s attorney also noted he had received unsolicited reports from firefighters in Virginia insisting Brown “worked his ass off.”

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The judge set another hearing for Nov. 20.