In a press briefing, national incident commander Adm. Thad Allen reported that the containment cap that had been capturing some of the oil flow from the Macondo well had to be removed after an under-water robot accidentally bumped into its venting system. The collision sent gas up the riser cap, which may or may not have created dangerous crystals. Engineers will examine the riser package before attempting to replace the cap.

But for now, the gusher is back.

Allen also reported two deaths as a result of cleanup efforts. More details when available.