Montana Republican lawmakers reportedly received suspicious letters with mysterious white powder

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• Letters containing a mysterious white substance were reportedly sent to Republican lawmakers in Montana.
• About 100 letters with similar suspicious white powder were also sent to lawmakers in Kansas, according to officials.
• A Tennessee legislative office was placed under lockdown after GOP leaders also received similar letters which included "obvious threats made by a liberal activist specifically targeting Republicans," according to a House spokesperson.

Republican lawmakers in Montana are sharing that they received letters with white powder as federal agents investigate mysterious substances similarly mailed to GOP officials in two other states.

In a Friday night tweet, Republican Gov. Greg Gianforte said he has received "disturbing" reports of anonymous threats sent to legislators. The Montana attorney general posted on Facebook that the local sheriff's office collected evidence after his mother, a state representative, opened one letter with a "white powder substance" sent to her home address.

"PLEASE BE CAUTIOUS about opening your mail," Montana Attorney General Austin Knudsen said in the post directed toward legislators. "If you receive a suspicious package, contact law enforcement immediately."

MORE THAN 70 LETTERS CONTAINING 'SUSPICIOUS' WHITE POWDER SENT TO KANSAS LAWMAKERS, OFFICIALS, FBI SAYS

Letters containing suspicious white powder were sent to GOP lawmakers in Montana amid a string of similar mailings in two other states. (Fox News)

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Republican officials in Tennessee and Kansas have recently received similar letters. A legislative office building in Nashville temporarily locked down on Thursday after the House Speaker said multiple Republican leaders got mail with "a white powder substance." The letters included "obvious threats made by a liberal activist specifically targeting Republicans," according to a House Republican Caucus spokesperson who did not provide further details.

The FBI said Thursday that ongoing lab tests did not indicate any risk to public safety.

About 100 such letters have been sent to lawmakers and public officials across Kansas, according to the Kansas Bureau of Investigation. Preliminary tests did not detect any common dangerous toxins and no injuries have been reported.