Police in Charlotte, N.C., are investigating after a threatening letter was sent to numerous lawmakers of color in the city, including Charlotte Mayor Vi Lyles (D) .

City officials told The Hill that African American members of Charlotte's city council received a letter filled with racist remarks, advocating that the lawmakers, all of whom are Democrats, be "tarred and feathered and run out of town."

The letters, which made numerous references to the lawmakers' ethnicities, were also sent to Councilwoman Dimple Ajmera (D), who is of Indian descent, according to a city spokesperson.

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"If I can assume the intent, the intent was to intimidate," Councilman Braxton Winston (D), a black lawmakers who received one such letter, told NBC affiliate WCNC.

"We get hate mail all the time," he added. "But this one was unique. … It was pretty intense, pretty intense, [and] pretty well thought out."

A spokesperson for the Charlotte mayor's office confirmed to The Hill that Lyles was among the Democrats who received letters, but said Lyles had not seen the letter personally as her staff had intercepted it.

Among other topics in the letter, the author expressed praise for President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's recent tweets aimed at four minority congresswomen that urged them to "go back" to other countries.

"I do believe you need to go back to where you came from if you don't BEGIN to show this great country some RESPECT and HONOR," the letter read.

"We'll round you up and send you screaming to the concentration camps where you belong," it continued.

A police spokesperson told The Charlotte Observer that an investigation into the letter's author was underway. “We are aware of the letters and [are] reviewing the material.”

The FBI told NBC Charlotte this week that the bureau is not currently investigating the letter, but former FBI Agent Chris Swecker said that could change.