An oil pumping jack, also known as a ‘nodding donkey,’ operates in an oil field near Samara, Russia. (Photographer: Andrey Rudakov/Bloomberg)

Oil Dragged Down by Swelling U.S. Stockpiles and Trade Tensions

(Bloomberg) -- Oil tumbled the most in almost three weeks as a raft of negative U.S. data revived fears of a supply glut while persisting U.S.-China trade tensions threaten demand.