April crude oil prices rallied overnight, supported by spreading unrest in the Middle East and ideas that US supplies declined last week. Some traders indicated that outside market sentiment was positive, with higher world stock markets and a weaker US Dollar. Early morning gains in April crude oil came from growing tensions in the Middle East that have spread into Libya and fostered ideas of supply disruptions out of the region. In the meantime, supply situation in the US remains a focal point. Private industry data Tuesday afternoon showed an unexpected decline in US crude stocks last week, compared to market expectations for a 2.25 million barrel build.