Federal investigators are looking into the possibility of corruption in the design, construction and maintenance of the flood barriers, U.S. Attorney Jim Letten said.
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Earlier this week, Attorney General Charles Foti said he wants to know whether poor construction or design flaws contributed to the failure.
The Orleans Parish district attorney's office also confirmed it started a preliminary investigation into the materials used in the flood walls. It is determining whether a grand jury should be impaneled.
Of the three, Blageur trusts Foti the most.