The Saudi central bank's net foreign assets fell by $12.8 billion in December from the previous month, central bank data showed on Thursday.

Net foreign assets fell to 1.555 trillion riyals ($413.22 billion) in December from 1.603 trillion riyals in November.

Net foreign assets were also down 5.3% year-on-year, the data showed.

($1 = 3.7510 riyals)

(Reporting by Nayera Abdallah and Enas Alashray; Editing by Ros Russell)