"We join the rest of the world in mourning the passing of Muhammad Ali and celebrating the legacy of this unique man in unifying us through his acts and gifts.
"Ali's charisma, grace, and genius transcended all races, religions, nationalities, and generations. His spirit will inspire people forever.
"HBO is honored to have known Muhammad Ali as a fighter of beauty and a man of principle. We experienced the joy of working with him in support of initiatives he passionately cared about including, most importantly, his never-ending desire to teach tolerance and understanding of others to all people.
"Muhammad Ali was an icon and hero, father and friend, and beacon of hope for oppressed people throughout the world. He will be missed by all of those whose lives he touched. There are not enough bells to toll this loss."