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CLAYTON, Mo. – The Ferguson grand jury decision is expected to be announced today, USA TODAY's Yamiche Alcindor reports.

This information has not been confirmed by the St. Louis County Prosecuting Attorney's Office.

NewsChannel 5 has confirmed Gov. Jay Nixon is heading to St. Louis. His plane should land shortly. He will speak with local clergy at 4 p.m.

The grand jury started hearing evidence in the case less than two weeks after Brown's death Aug. 9. The grand jury's term originally convened in May, and was scheduled to end in early September, but because the jurors were still hearing evidence, the termwas extended until January 2015.

In order to come to a decision, nine of the 12 jurors must agree. In August,NewsChannel 5 learned nine of the jurors are white, and three are black. Seven of them are male, five are female. Their identities are not expected to ever be released.

A look back at the ongoing unrest in Ferguson, Missouri, since the death of Michael Brown. The unarmed black teen was shot and killed by a white police officer. Video shot by KSDK.

On Oct. 1, a tweet sent from someone claiming to have inside knowledge of grand jury talks sparked an investigation by the St. Louis County Prosecuting Attorney's Office. The woman who owns the account from which the tweet was sent told CNN her Twitter account was hacked.

In October, specific testimony presented to the grand jury was leaked to media outletsaround the country, including information about the St. Louis County Medical Examiner's autopsy on Brown's body, and testimony from several black witnesses who supported Wilson's account of what happened.

An investigation ultimately determined grand jury members were not responsible for the leaks. The Department of Justice also denied leaking information.

In the days following Brown's death, protesters took to the streets of Ferguson demanding justice. At times there was riotingviolence, and looting. Dozens of people were arrested, and at times tear gas was used on protesters.

Initially, Wilson's name was not going to be released unless charges were filed. That changed on Aug. 15, when Ferguson Police Chief Tom Jackson identified Wilson as the officer in a news conference held at the QuikTrip that was set on fire during the riots earlier in the week. Jackson also released surveillance videos, photos, and a report about a strong-armed robbery that happened minutes before the Brown's death.

On Aug. 18, Nixon called in the Missouri National Guard after protests became increasingly violent. The night before, St. Louis County police said some protesters hadthrown Molotov cocktails at officers, but a protester USA Today spoke with denied that claim.

Preparations for an announcement have been ongoing for several weeks. On Nov. 17, Gov. Jay Nixon signed an executive order declaring a state of emergency and activated the Missouri National Guard. The order will expire Dec. 17.

Some businesses in the community began boarding up windows days in advance in an effort to prevent the vandalism and looting that occurred in the days following Brown's death. Others, like the Ferguson Burger Bar, opted to stay visible.

Wilson is a six-year veteran of the police force. Jackson says he has never had any disciplinary action while a member of his department. He was placed on paid administrative leave after the shooting and has been staying at an undisclosed location.