Police said they have dashcam and bodycam video and store surveillance footage of the shooting; none has been released.
In explaining its decision not to charge, the feds write that they would have had to prove "that the officers acted willfully".
Amundson didn't say anything about a verbal threat by Salamoni during his news conference and didn't respond to messages seeking comment. Just a day before the Sterling decision, Michael Slager, the SC officer who fatally shot unarmed motorist Walter Scott in the back in 2015, pleaded guilty to civil-rights charges as part of a deal. Both officers later told investigators they saw Sterling reaching for a gun.
The Justice Department said it found insufficient evidence to charge either officer, Blane Salamoni or Howie Lake II, in the death of 37-year-old Alton Sterling last summer outside a Baton Rouge convenience store.
That left the investigation and any decision to pursue state charges up to Landry, a tea party-aligned Republican and former sheriff's deputy who has been Louisiana's attorney general since January 2016 after burnishing his conservative credentials as a one-term congressman.
Veda Washington-Abusaleh, one of Sterling's aunts, said "the lawyers called and said they have not made a decision", Washington-Abusaleh said at last night's rally, according to The Times-Picayune.
Amundson said the entire altercation at the Triple S convenience store on North Foster Drive, "from approach to the six shots fired", took about 90 seconds.
"Most of the time, we are calling for federal intervention when the state can't actually do it", Robinson said.
Unlike in other police shootings, local, state and federal authorities did not make parallel inquiries into Sterling's killing.
"But I think the end result will be the same: There was no criminal conduct", he said.
The ruling set off fresh protests in the city, raising alarms among officials about another wave of protests similar to the ones that followed Sterling's death.
Police arrested almost 200 protesters in Baton Rouge in July following Sterling's death, which occurred a day before another black man was killed by police in Minnesota.
The East Baton Rouge District Attorney recused himself from any state criminal investigation into Sterling's death, citing his professional relationship with Salamoni's parents.
"This matter will be handled by the most professional and proficient law enforcement use of force team in Louisiana", Mr. Landry said in a statement. As retired Sergeant John Slater, who has seen his share of the dangers of police work during his years with the Henrico County, Virginia Police Department, told The New American, "You have to look at the totality of the circumstances".
Edwards said the leaked information also jeopardized carefully-devised public safety plans prepared for the announcement.
The vigil was held after news broke that the Department of Justice would not be charging two white police officers in connection with Sterling's death.
Between 1995 and 2015, according to a report from the the Pittsburgh Tribune-Review, almost all-a whopping 96%-of the civil-rights complaints against law enforcement got turned down by U.S. attorney's offices around the country.
The write-up also adds that bringing charges against officers in a civil rights case is incredibly hard as prosecutors must meet a high legal standard.