A New York woman has pleaded guilty in a Massachusetts federal court to sending four threatening letters containing an unknown white powder, including to U.S. Senator Scott Brown (R-Mass.).

On September 27, Roberta Cicora, 58, pleaded guilty in the court’s Springfield, Mass., division to mailing four threatening communications on May 2, 2011.

Cicora sent the letters to Brown, Massachusetts Attorney General Martha Coakley, the state district court in Greenfield, Mass., and the Franklin County House of Correction, also in Greenfield. After receiving the letters, each of the recipients closed their offices until Hazmat teams determined that the letters were not a safety threat.

Judge Michael Ponsor of the District of Massachusetts scheduled sentencing for January 10, 2013. Cicora faces up to 10 years in prison, plus three years of supervised release and a $250,000 fine.

At an August 8 hearing before Magistrate Judge Kenneth Neiman, Cicora slashed herself with a small razor blade before her attorney and federal officials stopped her, according to the Springfield newspaper, The Republican.

On the same date, Neiman revoked Cicora’s pretrial release based on “multiple tests confirming her use of drugs and her intention not to cease the use of marijuana, her defiance of reporting requirements and her statement to the pretrial service officer that she would no longer report, the ongoing difficulties concerning the mental health review, and her repeatedly aggressive posture towards the pretrial services officer and the court,” according to the court docket.

In an emailed statement, Cicora’s lawyer, Lori Levinson of Great Barrington, Mass., said, “She is remorseful and says she never wanted to hurt or scare anyone and is sorry that she did.”

Brown and the Franklin prison did not respond to requests for comment. Coakley’s office has no comment, said spokeswoman Jillian Fennimore.

The U.S. Attorney’s Office for the District of Massachusetts declined to comment, said office spokeswoman Christina DiIorio-Sterling.

Massachusetts court spokeswoman Joan Kenney declined to comment on behalf of the district court in Greenfield.

Sheri Qualters can be contacted at squalters@alm.com.