A California congresswoman was the target of a threatening package on Tuesday. 

A package labeled anthrax was found at the Los Angeles office of Democratic U.S. Rep. Maxine Waters. 

Police evacuated the scene as a precaution. 

HazMat crews with the Los Angeles Fire Department determined the package was not dangerous.

Investigators are trying to find out who left the package at the office. 

Waters is a vocal critic of President Trump, even calling for his impeachment.

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