At a glance | US police killings

REPORTED BY KALAHAN DENG

These are just some of the 623 people killed by US police officers in 2014

Michael Brown, 18: Shot twice in the head in Ferguson

Dontre Hamilton, 41: Shot 14 times in a park in Milwaukee

Eric Garner, 43: Died after being put in a chokehold by a New York police officer

Tamir Rice, 12: Gunned down in Cleveland after officers mistook his toy gun for a real one

Rumain Brisbon, 34: Killed by a Phoenix police officer who mistook pill bottle for a weapon

Walter Scott, 50: Gunned down whilst fleeing from a police officer at a traffic stop altercation.

Freddie Gray, 25: Arrested after running from a police officer, Freddie Gray died after an unbuckled journey in a police van that prosecutors have said was deliberately reckless.