Once confronted, the police officers determined that Sterling was in possession of a "firearm in his right front pocket" of a shirt he was wearing, Landry said.
Louisiana's attorney general has ruled out criminal charges against the two white officers.
Residents at the convenience store where Sterling was killed said they weren't surprised by Landry's decision.
Black Lives Matter activists announced Tuesday that they will hold rallies this week outside her office, and the local NAACP has asked the U.S. Justice Department to launch a federal investigation into the shooting.
Louisiana Attorney General Jeff Landry said Baton Rouge officers Blane Salamoni and Howie Lake had good reason to believe Sterling, 37, was armed with a gun and was continuously resisting arrest. Salamoni's lawyer, John McLindon, said he anticipated the department will fire both officers for a violation of policies as a result of the shooting, but that both officers are planning to appeal such firing. Critics expressed frustration at another police-involved shooting in which a Black man was executed without so much as a trial, calling it just another example of rampant police brutality in the United States. Sterling was shot and killed outside the store where he was selling CDs by Baton Rouge police.
The family of Alton Sterling is railing against the decision made by Louisiana authorities not to charge the two police officers who fatally shot him in 2016, saying those officers have gotten away with murder.
"This decision was not taken lightly", Landry said.
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It was also captured on body camera and convenience store surveillance.
Sterling's five children also filed a wrongful-death lawsuit against the officers past year. Moore's recusal left Landry's office to review evidence and decide whether any state charges were warranted.
Officer Blane Salamoni shot and killed Sterling during a struggle outside a convenience store.
"The people of this parish have been civil in their reaction to a long and frustrating process from federal and state authorities and now of course citizens of this parish have every right to peacefully and publicly protest", she said. In a summary of its findings, the Justice Department said Salamoni pointed his gun at Sterling's head but didn't mention any verbal threats by the officer.
Sterling's children filed a wrongful death lawsuit in 2017, alleging the shooting violated their father's civil rights and that it fits a pattern of racism and excessive force within the Baton Rouge Police Department.
Demonstrations remained strong after Sterling's death, which came a day before the police shooting of Philando Castile in suburban Minneapolis.
Quinyetta McMillon, the mother of Sterling's son, Cameron Sterling, said on Tuesday that the ruling emphasized their point. He then shot him three more times as Sterling sat up on his back.
After the shooting, the officers were placed on paid administrative leave.
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