None of the debris found so far in the Atlantic Ocean was from the Air France Airbus that disappeared on Sunday night, Brazilian military officials have said.
"We have not recovered any parts of the aeroplane so far," Ramon Borges Cardoso, the director of the Air Space Control Department, was quoted as saying on the Terra website.
An Air Force official confirmed Mr Cardoso's statement and said a detailed communique would be released later.
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Mr Cardoso also said the fuel slicks were not caused by jet fuel but by oil believed to have come from a passing ship.
Earlier on Thursday, Mr Cardoso had told reporters that navy ships 600 miles off Brazil's shore had pulled aboard debris from the Air France plane, including a pallet from its cargo hold and two buoys.
But after inspection it was determined the pallet could not have come from the plane.
