LONGMONT, Colo. — Police are employing forensic technology to learn who may have penned a racist letter sent to a Longmont family.

The family reported to police last week that they received a letter mailed to their home, referring to their skin color and telling them to get out, prompting concern.

"You and your family should not be in this white neighborhood. You and your brown boys are not welcome. Go back to where you came from. Your (sic) in Trump's country now. #MAGA," read the letter, which was left anonymous.

The hashtag stands for President Donald Trump's copyrighted saying "Make America Great Again."

Police say they've instructed units to keep an eye on the home and the neighborhood to ensure the safety of the family that received the letter.

The family has requested to remain anonymous through the investigation, although they have shared the message on social media with various people.

Police say they've yet to track down the sender, but are continuing their investigation.