The price of oil started the first full week of 2015 the way it ended the previous year: heading downwards with analysts from two different investment banks weighing on the commodity by cutting yearly forecasts.

U.S. crude fell about $2 to $50.64, after sliding to a session low of $50.40 a barrel, its weakest price since April 30, 2009, while Brent crude for February delivery was trading at $53.41 a barrel, losing $2.77. Both benchmarks hit fresh 5½-year lows on Monday.