Norwegian mass murderer Anders Behring Breivik accused prison officers of trying to drive him to suicide in conditions he describes as "a mini Abu Ghraib."

Breivik wrote a 27-page letter addressed to prison officials, a copy of which was obtained by The Associated Press on Friday.

"If it wasn't for the fact that I am an exceptionally patient person, I would most likely have lost my mind in pure frustration," Breivik said in the letter dated Oct. 15 that was updated on Oct. 26 and Oct. 30. "Anyway, there are limits to what a person can take."