The oil driller Baker Hughes reported on Friday that the number of active U.S. oil rigs fell by 2 to 316 last week. It was the lowest level since October 2009.

The number of gas rigs rose by 2 to 87.

Combined oil and gas rigs remained unchanged at 404.

The Fed Chairwoman Janet Yellen said at t Harvard University on Friday that an interest rate hike would be likely appropriate "in the coming months". She noted that the U.S. economy continued to improve, while inflation would reach the Fed's 2% target "over the next couple of years".

(raw materials / closing price /% change)

Oil 49.56 +0.47%

Gold 1,212.40 -0.12%