NEW ORLEANS (AP) - A satellite imaging expert says oil has reached the Mississippi Delta and the Chandeleur Islands off the Louisiana coast, and the crude is very close to coming ashore. Hans Graber, director of the University of Miami's satellite sensing facility, said Wednesday that two satellite images also show oil drifting to the south, toward the Loop Current. Scientists say this current could carry oil toward Florida and the Keys. Graber says the northern edge of the current may already have picked up some oil. The Associated Press reported last week that a rainbow sheen of oil had come ashore at the mouth of the Mississippi. BP PLC received a report Tuesday that oil had washed ashore at the Chandeleur Islands, but more than 20 boats were sent there and could not find the oil on shore.