Oil lowest since 2009 amid supply glut

London

World oil prices tumbled close to six-year lows last week, as record-high US crude inventories deepened worries over the global supply glut.

In another blow, official data on Friday showed that the US economy slowed sharply in the fourth quarter of 2014, sparking fears over demand in the United States, which is the world's biggest oil consumer.

New York crude…