as far as someone knows
US /æz fɑːr əz ˈsʌm.wʌn noʊz/
UK /æz fɑːr əz ˈsʌm.wʌn noʊz/

1.
per quanto ne so, a quanto pare
used to say that you think something is true, but that there may be things you do not know
:
•
As far as I know, he's still working there.
Per quanto ne so, lavora ancora lì.
•
As far as we know, no one was injured in the accident.
Per quanto ne sappiamo, nessuno è rimasto ferito nell'incidente.