In Ohio, hundreds of gallons of drilling fluid have spilled into a creek from a shale well being prepared for fracking. Officials say the leak was discovered on Sunday. About 1,600 gallons of the fluid, known as “mud,” gushed out before the spill was contained on Wednesday. Nearby residents were evacuated amid fears of a natural gas explosion. The company, PDC Energy, said it still plans to move forward with fracking the wells.