Oil falls by most in a week since January on OPEC tensions

By Scott DiSavino NEW YORK (Reuters) - Oil futures on Friday fell by their biggest weekly percentage decline since January of around 9 percent as signs of tensions resurfaced between Saudi Arabia and Iran that could scupper a key supply cut pact. Traders also noted a surge in U.S. crude inventories last week and muted demand continued to weigh on futures. Old disputes between Saudi Arabia and rival Iran resurfaced at a meeting of OPEC experts last week, with Riyadh saying it could raise oil outp