Washington Post:

The gulf well is an uncapped geyser again after an accident forced officials Wednesday to remove the containment device that had been effectively capturing much of the gushing oil for weeks.
Separately, the response to the spill took a tragic turn when two people associated with the clean-up died in unrelated incidents, one a swimming pool accident and the other involving a person enlisted in the effort to skim oil, Coast Guard Adm. Thad Allen announced. He had no further information about the two deaths, which he learned about just before his noon EDT briefing.
Allen said the accident involving the containment operation was also under investigation, but he outlined the early theory of what happened. At 9:45 a.m. EDT engineers aboard the drillship Discoverer Enterprise noticed gas rising through a water line that had been pumping hot water down to the sea floor to prevent methane hydrates from clogging the cap.
The appearance of gas created a hazardous situation on the ship, which has been rigidly connected to the well via a riser pipe and the containment cap. Engineers disengaged the cap and the riser. Scrutiny of the cap indicated that a vent had been inadvertently closed, possibly bumped by one of the many remotely operated vehicles, or ROVs, that conduct the subsea operations, Allen said.