/Suzanne Muscara, 37, allegedly sent the letter to Collins in October.

Suzanne Muscara, 37, allegedly sent the letter to Collins in October.

A 37-year-old Maine woman has been arrested for allegedly sending a threatening letter to Sen. Susan Collins, authorities said Monday.

Sen. Susan Collins talks to reporters on Capitol Hill, Sept. 17, 2018, in Washington.(Win McNamee/Getty Images, FILE) Sen. Susan Collins talks to reporters on Capitol Hill, Sept. 17, 2018, in Washington.

Suzanne Muscara, of Burlington, was arrested Friday with mailing “threatening communication” to Collins, according to the U.S. attorney’s office.

The letter, sent in October 2018, was leaking a fine white powder and contained a threat, according to federal prosecutors. Muscara allegedly sent the letter to Collins’ home in Bangor.

At the time her communications director said it was said to have been contaminated with ricin though tests later confirmed there was nothing toxic.

The threatening letter was received by Collins’ husband, Tom Daffron, not long after the Democrat was criticized for her decision to vote for the confirmation of Brett Kavanaugh to the Supreme Court.

If convicted, Muscara faces up to 10 years in prison and $250,000 fine.

She was due to make an initial appearance in federal court in Bangor Monday at 2:30 p.m.

In announcing her arrest federal prosecutors said nothing about Muscara’s motive.

It was not immediately clear whether she had an attorney.

The arrest comes a few days after a 55-year-old New York man was arrested for allegedly threatening to murder Minnesota Rep. Ilhan Omar.

Democratic Representative from Minnesota Ilhan Omar attends a joint meeting of the Congress, on Capitol Hill in Washington, April 3, 2019.(Michael Reynolds/EPA via Shutterstock) Democratic Representative from Minnesota Ilhan Omar attends a joint meeting of the Congress, on Capitol Hill in Washington, April 3, 2019.

Patrick W. Carlineo Jr. allegedly called one of the congresswoman’s staffers on March 21 with a threat.

“Do you work for the Muslim Brotherhood?” Carlineo allegedly said in the call. “Why are you working for her, she’s a [expletive] terrorist. I’ll put a bullet in her [expletive] skull.”

Carlineo has a hearing in federal court on Wednesday. He, too, faces 10 years in prison or a $250,000 fine if convicted.