abu dhabi/dubai unite arab emirates central bank ask bank finance company uae provide information account 19 saudi citizens bank source tell reuters thursday saudi authorities previously confirm almost 19 detain sweep corruption investigation one prince alwaleed bin talal chairman international investment firm kingdom hold regulators request contain circular send early week bank respond source say add bank ask freeze account officials central bank available comment commercial bankers say believe uae authorities act request saudi authorities confirm saudi officials say try recover billions dollars illicit assets dozens senior businessmen officials detain probe saudi arabia mutual legal assistance arrangements gulf arab countries help seek information criminal case uae ask bank information 19 saudis account source