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Officials say an inmate assaulted theater shooter James Holmes and a security officer at the Colorado State Penitentiary.

Adrienne Jacobson, a spokeswoman for the Colorado Department of Corrections, told The Denver Post that the inmate lunged at Holmes and took a few swings at him while the officer was escorting Holmes through a hallway on Oct. 8. Holmes was not injured.

Jacobson told The Associated Press that the 27-year-old inmate accused of attacking Holmes will be disciplined during a hearing inside the prison.

Holmes is allowed to spend four hours in a day hall. No other inmates are in his cellblock.

A judge in August sentenced the 27-year-old to life in prison without parole for killing 12 people and wounding 70 others at a movie theater in suburban Denver in July 2012.