7-Mile Oil Slick in the Gulf

AP noted on Wednesday:

The Plaquemines Parish president, Billy Nungesser, says oil has been spotted in the waters off the coast near Venice and that he believes the seven-mile slick is from last year’s BP spill [and] there have been no recent reports to the Coast Guard of spilled oil in the area.

Is this:

• 1. A new leak, the source of which hasn't yet been discovered

• 2. Old BP oil being churned up from the bottom of the ocean

or

• 3. A sign that the BP well has started leaking again?

I'm not sure, but time will tell.