Oil prices plunge after high-stakes Doha talks fail

Oil plunged on Monday after the world's top producers failed to reach agreement on capping output to ease global oversupply, as tensions between Iran and Saudi Arabia stymied an anticipated deal. Prices tumbled more than five percent in early Asian trade after top producer Saudi Arabia said a deal must include all members of the OPEC producer cartel -- including rival Iran, which boycotted the talks. Many had expected Sunday's talks to reach a deal to stem a nosedive in oil prices that has seen