The AP reports that the Gretna police chief is defending himself against charges of racism:
Police Chief Denies Race Role in Blockade
The police chief in a New Orleans suburb is defending himself against accusations of racism for ordering the blockade of a bridge and turning back desperate hurricane refugees.
The word "suburb", although perhaps accurate (or perhaps not since it's directly across a bridge from NO) is probably intended to cause you to think "white".
And those news orgs love getting people on the defensive, don't they?
And, of course, there's the word "desperate", perhaps designed to prejudice you against the chief.
This article doesn't have much information beyond the LAT article, and I'm sure I could have created the AP article from the LAT article if I had to. Whether it's just a summary of the LAT article is unknown.
Also here as "Suburban Police Chief Says Race Played No Role in Blockade of Bridge to New Orleans".