A civil rights group says the transgender soldier imprisoned in Kansas for sending classified information to the anti-secrecy website WikiLeaks now faces possible punishment for offenses stemming from a suicide attempt.

The American Civil Liberties Union said in a statement that Chelsea Manning, a 28-year-old transgender soldier, received a document from Army officials Thursday saying she's being investigated for "administrative offenses," including "conduct which threatens," related to her July 5 suicide attempt.

The ACLU says if Manning's convicted of the offenses she could be placed in indefinite solitary confinement.

An Army spokesman didn't immediately respond to an email seeking comment.

Manning, arrested as Bradley Manning, was convicted in 2013 in military court for leaking more than 700,000 secret military and federal documents when she was an intelligence analyst in Iraq.