The Deepwater Horizon oil rig is seen burning in the Gulf of Mexico more than 50 miles southeast of Venice on Louisiana's tip on April 21, 2010. A federal probe has found that a trapped piece of drill pipe prevented a blowout preventer from properly sealing to stop last year's massive Gulf oil spill. (AP Photo/Gerald Herbert, File)
Read the article: Gulf oil spill probe: Pipe piece caused blowout preventer failure
