[img]http://d.yimg.com/a/p/ap/20100510/capt.d38ea6022dc04558869e7dc0521ac99d-d38ea6022dc04558869e7dc0521ac99d-0.jpg?x=130&y=86&q=85&sig=rX8b8c7EccLqS8hELehdLA--[/img]AP - BP PLC told Congress Tuesday its massive Gulf oil spill was caused by the failure of a key safety device made by another company.