Mystery powder letters sent to Kansas Republicans, Trump, Supreme Court Justice Thomas

A series of threatening letters containing a mysterious white powder is raising concerns that Republican lawmakers in Kansas and across the nation who received them are being targeted by someone cryptically calling themselves “your secret despirer,” according to authorities and recipients of the letters.

Since Friday, about 100 letters have been received by Kansas GOP lawmakers and Kansas Attorney General Kris Kobach, who is also a Republican, officials said.

The list of intended recipients of white powder letters is growing and expanding beyond Kansas, federal law enforcement sources told ABC News.

Similar letters containing a cryptic note and a “suspicious powdery substance” were addressed to former President Donald Trump, Supreme Court Justice Clarence Thomas and other high-profile individuals, though the U.S. Postal Inspection Service intercepted them before they were delivered, the sources said.

Read more: ABC News