His lawyer confirmed the letter was authentic and that Anders will begin hunger strike if he does not hear back from prison authorities.
The far-right fanatic Breivik is serving a 21-year prison sentence for killing 8 by bombing government headquarters in Oslo, before heading to a Labour party youth camp and opening fire, killing 69.
A body and victim's clothes can be seen close to the water after the attacks on the Norweigan island
His horrific campaign hit headlines two years ago, as stories emerged of teenagers being shot in the water as they tried to swim away from the island.
Breivik's motivation for the attacks was allegedly to 'save' Norway and Europe from a Muslim takeover, targeting the Labour Party for 'letting down Norway and the Norweigian people.'