HOUSTON (Dow Jones)–BP PLC’s (BP, BP.LN) plans to test the integrity of an overflowing well in the Gulf of Mexico have been delayed again because of an "unexpected," problem with a piece of equipment, a company senior vice president said Thursday.

The postponement is just another setback for a company under pressure to contain the well, which has caused one of the worst environmental disasters in the history of the U.S. The Macondo well began gushing shortly after the April 20 explosion and subsequent sinking of Transocean Ltd.’s (TNT.YY) Deepwater Horizon drilling rig…

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