Federal investigators will now get involved in the inquiry of two white police officers in Baton Rouge shooting and killing a black man already pinned down on the ground. The incident was recorded by a witness on a cell phone.

FOX's Eben Brown reports:

The Department of Justice will investigate the shooting death of 37-year-old Alton Sterling. Local authorities are already pledging cooperation:

(Holden) "It's very, very important that you understand we are doing our best to make sure we get all the answers."

That's Baton Rouge's mayor, Kip Holden. Local prosecutor Hillar Moore hopes people won't rush to judgement:

(Moore) "I want to let you know that you're in a community that is very good community, despite the one issue that you're here for, this is a great community."

Police say Sterling was armed, but the video circulating online shows him subdued.

Eben Brown, FOX News.

Follow FOX's Eben Brown on Twitter: @FOXEbenBrown

Man shot dead by police sparks protests in Louisiana

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