AP - A summary of events Tuesday, July 20, Day 91 of the Gulf of Mexico oil spill that began with the April 20 explosion and fire on the drilling rig Deepwater Horizon, owned by Transocean Ltd. and leased by BP PLC, which is in charge of cleanup and containment. The blast killed 11 workers. Since then, oil poured into the Gulf from a blown-out undersea well until BP managed to stanch the leak Thursday — at least temporarily — with a massive cap.

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