Five missing workers in Oklahoma well fire presumed dead

After an explosion at an oil and gas drilling site in eastern Oklahoma, the search for five missing workers has been called off. It is now a recovery mission for the three men from Oklahoma, one from Texas and one from Colorado, who are now presumed dead. If confirmed, the accident will be the deadliest U.S drilling mishap since the 2010 Deepwater Horizon offshore rig explosion. The cause of the explosion is yet to be determined.