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Mourners light candles at a memorial for 16-year-old Kimani "Kiki" Gray who was killed in a shooting involving the New York Police Department in the Brooklyn borough of New York, March 12, 2013. REUTERS/Lucas Jackson ( USA/ )

A sign with mourners' notes hangs on a wall above a memorial for 16-year-old Kimani "Kiki" Gray after he was killed in a New York Police Department shooting in the Brooklyn borough of New York, March 11, 2013. Picture taken March 11, 2013. REUTERS/Lucas Jackson ( USA/ )

Mourners stand by a memorial for 16-year-old Kimani "Kiki" Gray after he was killed in a New York Police Department shooting in the Brooklyn borough of New York, March 11, 2013. Picture taken March 11, 2013. REUTERS/Lucas Jackson ( USA/ )

NYPD crowd control officers keep watch on a march of demonstrators as they protest against the shooting of Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

NYPD officers keep watch on a building before a march beginning at a memorial for Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

New York Police Department (NYPD) officers run to take position during a protest against the killing of 16-year-old Kimani "Kiki" Gray who was killed in a shooting involving the NYPD, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

A youth shouts slogans against New York Police Department (NYPD) officers during a protest against the killing of 16-year-old Kimani "Kiki" Gray, who was killed in a shooting involving the NYPD, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

New York Police Department (NYPD) officers arrest a man during a protest against the killing of 16-year-old Kimani "Kiki" Gray who was killed in a shooting involving the NYPD, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

People take part in a protest against the killing of 16-year-old Kimani "Kiki" Gray, who was killed in a shooting involving the New York Police Department (NYPD), in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

People confront New York Police Department (NYPD) officers during a protest against the killing of 16-year-old Kimani "Kiki" Gray who was killed in a shooting involving the NYPD, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

New York Police Department (NYPD) officers arrest people during a protest against the killing of 16-year-old Kimani "Kiki" Gray who was killed in a shooting involving the NYPD, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

New York Police Department (NYPD) officers take position to stop demonstrators during a protest against the killing of 16-year-old Kimani "Kiki" Gray, who was killed in a shooting involving the NYPD, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

Carol Gray (C) is embraced by City Councilman Charles Barron (R) during a press conference regarding the death of her son Kimani Gray who was killed in a New York Police Department shooting in the Brooklyn borough of New York, March 14, 2013. REUTERS/Lucas Jackson ( USA/ )

Carol Gray (centre L) shows a photograph of her late son Kimani Gray, who was killed in a New York Police Department shooting, next to City Councilman Charles Barron (centre R) and her lawyer Kenneth Montgomery (L) during a news conference in the Brooklyn borough of New York, March 14, 2013. REUTERS/Lucas Jackson ( USA/ )

A child holds a candle at a memorial for Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

Demonstrators march through East Flatbush as they protest against the shooting of Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

An NYPD officer peers over the edge of a building before a march beginning at a memorial for police shooting victim Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

Bystanders look on as demonstrators march from a memorial for Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

Bystanders look on as demonstrators march from a memorial for Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

NYPD police officers look on as demonstrators march from a memorial for Kimani "Kiki" Gray on Thursday, March 14, 2013 in the East Flatbush neighborhood of Brooklyn, N.Y. The 16-year-old was shot to death on a Brooklyn street last Saturday night by plainclothes police officers who claim the youth pointed a .38-caliber revolver at them, while the family says Gray was unarmed. (AP Photo/John Minchillo) ( Police Shooting Teen )

A mourner lights candles at a memorial for 16-year-old Kimani "Kiki" Gray who was killed in a shooting involving the New York Police Department, in the Brooklyn borough of New York March 13, 2013. REUTERS/Eduardo Munoz ( USA/ )

Candles stand lit on a street corner making up a memorial for 16-year-old Kimani "Kiki" Gray, after he was killed in a New York Police Department shooting in the Brooklyn borough of New York, March 11, 2013. Picture taken March 11, 2013. REUTERS/Lucas Jackson ( USA/ )