As the pic from the spill-cam suggested, something happened here.
Coast Guard Admiral Thad Allen, leader of the Federal response to the BP oil disaster, announced this morning that an accident involving a robotic submarine at the site of the leaking well has dislodged the containment cap which had been capturing a significant portion of oil gushing from the well. As a result, Allen said, the oil is now flowing freely into the Gulf.
This should be fixed again “soon”, they hope.
Gulf spill June 22nd 2010 (wiki/full size here)
A few days might do little difference on the total amount filling the Gulf between April and August, but still. And the relief wells have some concerning odds about failure.