OAK RIDGE, Tenn. (AP) _ Defense attorneys have filed an appeal in the case of an 84-year-old nun and two other activists convicted of breaking into and defacing a storage bunker holding bomb-grade uranium in a peace demonstration at a Tennessee weapons plant.

The Knoxville News Sentinel reports the appeal filed Monday with the Sixth Circuit U.S. Court of Appeals in Cincinnati challenges their convictions on a sabotage charge.

The nun, Megan Rice, was sentenced in February along with activists Greg Boertje-Obed and Michael Walli.

The three activists cut through three fences on July 28, 2012, and reached a storage bunker that holds the nation's primary supply of bomb-grade uranium. They painted messages, hung banners and threw blood on the bunker wall.