"The Charlotte-Mecklenburg Police Department has been contacted. We are aware of the letters and reviewing the material," department spokesman Robert Tufano said in a statement Friday.
The letters, all mailed within days of each other, were sent to the offices of Mayor Vi Lyles, six members of the city council and five members of the county commission, officials said.
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All of the lawmakers are African American, with the exception of Councilwoman Dimple Ajmera, who is an immigrant from India who moved here as a teenager.
The letters were identical and apparently sent by the same person, Mayor Lyles' spokesman Jeremy Mills said Friday.
"I've received individual hate letters, but this is the first where it was sent to people throughout the city," Ajmera told NBC News.
The writer said they support the work of President Donald Trump, criticized former President Barack Obama, wants to keep statues and memorials to Confederate leaders and wants to remove any public tributes to slain civil rights leader Martin Luther King.