In a letter to the people of Norway written under his name, the boxing great says his "heart goes out to each of you as you deal with the unimaginable grief of your loss."
Ali wrote that no one should fear multiculturalism. The man who confessed to the massacre says the attacks were part of a plan to purge Europe of Muslims.
Ali is a Muslim. He says those who commit such acts "fail to understand that we share far more with our fellow beings than those aspects that set us apart."
Ali suffers from Parkinson's syndrome. His spokesman says the former heavyweight champion communicated his thoughts in the letter to his wife.