A participant holds a sign at a prayer vigil for Michael Brown outside the McNamara Federal Building in Detroit Monday, Aug. 25, 2014. Brown, a black 18-year-old who was unarmed, he was shot Aug. 9 in Ferguson, Mo., by Officer Darren Wilson, who is white. A grand jury is considering evidence in the case and a federal investigation is also underway. (AP Photo/Paul Sancya)

Officials in St. Louis County, Missouri, said they are “looking into” allegations of misconduct on the grand jury hearing the case against Ferguson police Officer Darren Wilson, who fatally shot 18-year-old Michael Brown in August.

The county prosecutor's office received information Wednesday morning suggesting that a juror may have discussed evidence in the case with a friend, office spokesman Ed Magee told The Washington Post.

At 9:45 a.m. Wednesday, a woman with the Twitter handle @thesusannichols tweeted, “I know someone sitting on the grand jury of this case There isn’t enough at this point to warrant an arrest,” according to the St. Louis Post-Dispatch.

The @thesusannichols account has since been deleted, but activist Shaun King tweeted a screenshot of the message Wednesday afternoon:

Within seconds of posting this, her friends told her to delete it and she did. It was screenshotted first. pic.twitter.com/b6kTf9p40h — Shaun King (@ShaunKing) October 1, 2014

Prosecuting Attorney Robert McCulloch told the St. Louis Post-Dispatch he doesn’t believe any jurors are really gabbing about the case to friends.

“I’d be shocked if a member of the grand jury said anything,” McCulloch said.

Wilson, who is white, shot Brown, who was black and unarmed, on Aug. 9, setting off massive protests in Ferguson.

The grand jury, which has been hearing evidence since Aug. 20, is tasked with determining whether a crime was committed, as well as "whether there is probable cause to believe the defendant committed it.” If the jury decides Wilson committed a crime, he can be formally charged.