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Amo and 32 Democratic colleagues have asked the FBI and ATF for an update on the case, and specifically about the gun used.
DHS is leading the investigations, not the FBI, which has raised questions about independence, and local officials have been cut out where there is usually cooperation.
Investigators later recovered a broom, a shell casing, and a bullet from the scene of the shooting.
CBS News has learned that the federal agents involved in the fatal shooting of Alex Pretti are on administrative leave. CBS News correspondent Ian Lee has the latest from Minneapolis.