The city is on track to have more than 500 killings for just the third time since 2004.
The number of law enforcement officers shot and killed during the first quarter of 2016 has more than doubled over the same period last year.
Police found three sticks with the word "dynamite" on them.
Former Mesa police officer Philip "Mitch" Brailsford has been charged with second-degree murder in Daniel Shaver's death.
Sheriff's deputies were seen in a video beating Stanislav Petrov in a San Francisco alley.
"There are names within our current culture who deserve the attention more so than these 'celebrities,'" the activist group said after adding Michael Brown, Tamir Rice and Freddie Gray to the Walk of Fame.
The prosecutor said the two police officers reasonably believed that 24-year-old Jamar Clark was reaching for an officer's gun.
The lethal injection was called off at the last minute after the inmate argued he was not competent to be executed.
The company was fined $10 million after an American family was hospitalized in the U.S. Virgin Islands following methyl bromide exposure.
This is the latest effort in President Obama's attempt to implement criminal justice reforms.
