The Latest on the call by family members and community advocates demanding someone be held accountable for the shooting death of 18-year-old Ramarley Graham (all times local):

4 p.m.

New York City police officials say it is too soon to say whether a white officer will face internal charges for the shooting of an unarmed black teenager who was killed in front of his grandmother and 6-year-old brother.

First Deputy Police Commissioner Benjamin Tucker said Thursday that the case against Officer Richard Haste is still being reviewed.

Democratic Mayor Bill de Blasio says he would not prejudge the outcome of the New York Police Department's internal proceedings.

About 30 people marched 17 miles Thursday to police headquarters demanding someone be held accountable for 18-year-old Ramarley Graham's 2012 death.

Federal prosecutors declined to file civil rights charges against Haste. The officer said he thought Graham was reaching for a gun.

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10:30 a.m.

Relatives and supporters of an unarmed black teenager shot to death by a white New York City police officer in front of his grandmother and 6-year-old brother are marching 17 miles to bring attention to their cause.

About 30 people started a daylong walk Thursday from the Bronx toward police headquarters in lower Manhattan. They chanted, "Whose streets? Our streets."

City Councilman Andy King says someone must be held accountable for 18-year-old Ramarley Graham's 2012 death.

The teen's mother wants all the officers involved to be fired.

In March, federal prosecutors declined to file civil rights charges against Officer Richard Haste. The officer said he thought Graham was reaching for a gun. Haste's lawyer has said there were "never any winners in this case."

Police department disciplinary proceedings are underway.