Officials say one patch was a mile long and a couple hundred yards wide near Horn and Ship islands, and another one was south of Petit Bois Island near the Alabama line.
State Department of Marine Resources director Bill Walker says the boom-pulling and skimmer boats should be able to prevent landfall of anything worse than a light sheen.
Walker says the larger patch came through Dog Keys Pass and was about a mile inside Horn and Ship islands when it was spotted Wednesday.
BP has confirmed that mousse, tar balls and emulsion were found in the areas.
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