WASHINGTON — Amnesty International on July 29 called for the release of U.S. Army Pvt. Chelsea Manning a year after a military prosecutor convicted her of charges related to the leaking of classified documents to Wikileaks.

“It is an absolute outrage that Chelsea Manning is currently languishing behind bars whilst those she helped to expose, who are potentially guilty of human rights violations, enjoy impunity,” said Erika Guevara Rosas, director for the Americas at Amnesty International, in a statement posted to its website. “The U.S. government must grant Chelsea Manning clemency, order her immediate release, and implement a thorough and impartial investigation into the crimes she uncovered.”

Army Col. Denise Lind last August sentenced Manning to 35 years in prison.

Manning subsequently announced she had begun to transition. A Kansas judge in April approved Manning’s request to legally change her name to Chelsea Elizabeth Manning.

The Pentagon earlier this month announced that Manning will begin to receive treatment that could include hormone therapy and allow her to wear women’s underwear at Fort Leavenworth, Kan., where she is serving her sentence.

LGBT rights advocates last August criticized the Army’s initial denial of Manning’s request to undergo treatment for gender identity disorder.