Thousands of demonstrators marched in major cities across the United States on Friday in a fresh wave of protests against a spate of killings of unarmed black men by white police officers

Thousands of demonstrators marched in major cities across the United States on Friday in a fresh wave of protests against a spate of killings of unarmed black men by white police officers.
  
The signs of growing discontent took place as a New York prosecutor said that a grand jury would consider charges in one of the cases that has again brought to the fore the distrust felt by many African Americans towards the police.
  
Akai Gurley, 28, a father of a young daughter, was shot dead when a police officer opened fire in a dimly lit staircase at a Brooklyn apartment building as he walked with his girlfriend late on November 20.
  
Brooklyn District Attorney Ken Thompson said he would present all the evidence for a grand jury to decide whether charges should be brought. "It is important to get to the bottom of what happened," he said, giving no timetable for the jury to be appointed, nor for a decision to be reached.

"I pledge to conduct a full and fair investigation and to give the grand jury all of the information necessary to do its job. That information is still being gathered," Thompson said.
  
New York's police commissioner has said Gurley was a totally innocent victim and the family, who gathered for a private wake on Friday night ahead of the funeral on Saturday, has demanded justice.