HOUSTON (Reuters) - BP said on Friday the cement seal on its crippled Gulf of Mexico oil well was holding and a relief well to permanently plug the ill-fated borehole was on track to reach its target in mid-August.
As the final stages of the long-awaited "kill" operation moved forward, nagging questions remained about the lasting environmental and economic impact to the U.S. Gulf region from the world's worst offshore oil accident.
