Oil prices see biggest weekly decline since early May

Oil prices rose for the first time in seven trading sessions on Friday as the US dollar eased, but still saw their biggest weekly decline since early May.  Anxiety ahead of the next week’s referendum on UK membership of the EU has unsettled global markets and weighed on riskier assets such as commodities.  Oil has also been hit by concerns that higher prices could boost US production just as supply disruptions ease. Brent, the international oil marker, has rallied 70 per cent since plummeting to a 13-year low of less $30 a barrel in January