Oil prices rose on Thursday after data showed US crude stockpiles fell more than expected last week and a fresh attack by Houthi forces on ships off Yemen’s coast underscored the peril facing trade in a key global transit route. Brent crude futures were up $1.29, or 1.6 per cent, to $81.33 a barrel at 1521 GMT , while US West Texas Intermediate crude was up $1.37, or 1.8pc, to $76.46 a barrel.