what causes my serpentine belt to break on 2000 Lexus GS300

this problem just occured a few days ago with this strange noise like a chain rotating with alot of slack

Asked by for the 2000 Lexus GS300
1 answer
More than likely the bearing in one of the accesories (Alternator, Power Steering pump, A/C compressor, idler pulley, etc) failed.