Michael Brown Sr., (C) at the spot where his son was killed, hugs his wife Cal Brown during the 4-1/2 minutes of silence to mark the one-year anniversary of the killing of his son Michael Brown in Ferguson, Missouri August 9, 2015. Several hundred people gathered in Ferguson, Missouri, on Sunday to mark the one-year anniversary of the shooting death of an unarmed black teenager by a white police officer that sparked protests and a national debate on race and justice. (Photo by Rick Wilking/Reuters)

Michael Brown Sr., at the spot where his son was killed, comforts his wife Cal Brown during the 4-1/2 minutes of silence to mark the one-year anniversary of the killing of his son Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

Michael Brown Sr. (C), at the spot where his son was killed, listens with other family members at an event to mark the one-year anniversary of the killing of his son Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A man is detained while protesters march through the streets after holding a rally at Barclays Center marking the first anniversary of the death Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

Protesters perform a “die-in” while they take part in a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

Protesters perform a “die-in” while they take part in a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

A protester has her face covered while people take part in a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

Protesters march through Brooklyn streets after holding a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

Protesters take part in a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

A protester performs a “die-in” while people take part in a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

A protester shouts slogans against police while people take part in a rally at Barclays Center marking the first anniversary of the death of Michael Brown, in Brooklyn, New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

Michael Brown Sr. (2nd R) leads a march after an event to mark the one-year anniversary of the killing of his son Michael Brown in Ferguson, Missouri August 9, 2015. Hundreds of people marched, prayed and held moments of silence in Ferguson, Missouri on Sunday to mark the anniversary of the shooting death of an unarmed black teenager by a white police officer a year ago. (Photo by Rick Wilking/Reuters)

Georgia Haynes of the Mistory Dance Co. waits before a protest march in Ferguson, Missouri August 8, 2015. (Photo by Rick Wilking/Reuters)

A young relative of Michael Brown places a stuffed animal at a memorial to Brown before a protest march in Ferguson, Missouri August 8, 2015. (Photo by Rick Wilking/Reuters)

A St. Louis County motorcycle police officer clasps hands with a protester at a protest march in Ferguson, Missouri August 8, 2015. (Photo by Rick Wilking/Reuters)

A girl carries an upside down U.S. flag during a protest march in Ferguson, Missouri August 8, 2015. (Photo by Rick Wilking/Reuters)

Capt. Ron Johnson of the Missouri State Highway Patrol carries sleeping Quinn Edwards, 4, after taking him from his father Frankie (in shorts next to Johnson) to put him on his UTV during a protest march in Ferguson, Missouri August 8, 2015. (Photo by Rick Wilking/Reuters)

Protesters take part in a small rally at Union Square marking the first anniversary of the death of Michael Brown, an unarmed black teenager shot dead by a white police officer in Ferguson, Missouri a year ago, in New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

A protester takes part in a small rally at Union Square marking the first anniversary of the death of Michael Brown, an unarmed black teenager shot dead by a white police officer in Ferguson, Missouri a year ago, in New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

A man with a poster takes part in a small rally at Union Square marking the first anniversary of the death of Michael Brown, an unarmed black teenager shot dead by a white police officer in Ferguson, Missouri a year ago, in New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

A child records protesters while they take part in a small rally at Union Square marking the first anniversary of the death of Michael Brown, an unarmed black teenager shot dead by a white police officer in Ferguson, Missouri a year ago, in New York August 9, 2015. (Photo by Eduardo Munoz/Reuters)

Michael Brown Sr. (C), at the spot where his son was killed, hugs his wife Cal Brown at an event to mark the one-year anniversary of the killing of his son Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A protest march led by Michael Brown Sr. walks the streets to mark the one year anniversary of the killing of son Michael Brown Jr. in Ferguson, Missouri, August 9, 2015. (Photo by Rick Wilking/Reuters)

A partially burned American flag lies on the street near the spot where Michael Brown was killed before an event to mark the one year anniversary of his killing in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

Two white women lead two black women in prayer at the site of last year's riots on the one year anniversary of the killing of Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

Two white women lead two black women in prayer at the site of last year's riots on the one year anniversary of the killing of Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A Ferguson police unit is parked at outside the looted Bowen Beauty Supply at the site of last year's riots on the one year anniversary of the killing of Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A woman taunts police standing outside the looted Bowen Beauty Supply at the site of last year's riots on the one year anniversary of the killing of Michael Brown in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

Supporters of Michael Brown wear shirts with his picture and the message “Chosen 4 ChangeÆ as they take part in a remembrance ceremony at the spot where he was shot and killed Sunday, August 9, 2015, in Ferguson, Mo. Sunday marks one year since Michael Brown was shot and killed by Ferguson police officer Darren Wilson. (Photo by Jeff Roberson/AP Photo)

A black man is loaded into an ambulance after a police officer involved shooting in Ferguson, Missouri August 9, 2015. Two people were struck by gunfire in the midst of a late-night confrontation on Sunday between riot police and protesters, police said, after a day of peaceful events commemorating the fatal shooting of an unarmed black teenager by a white officer one year ago. (Photo by Rick Wilking/Reuters)

Protesters fall to the ground to take cover after shots were fired in a police-officer involved shooting in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A police officer holds his service pistol as he took cover after shots were fired in a police-officer involved shooting in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

Protesters run to take cover after shots were fired in a police-officer involved shooting in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A black man lies dead with blood on his shirt after a police officer involved shooting in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)

A woman reacts after shots were fired in a police-officer involved shooting in Ferguson, Missouri August 9, 2015. (Photo by Rick Wilking/Reuters)