French investigators said Wednesday more than 400 pieces of Flight 447 have been recovered in a painstaking search in the Atlantic but no conclusions have yet been reached in the probe.
"If we had concluded or excluded something, we would have told you," said Paul-Louis Arslanian, head of the French air accident investigation agency BEA.
Still, he expressed "a little more optimism" in finding clues to what caused the crash as discovery of more debris narrowed the vast search zone off the northeast coast of Brazil.
The Air France Airbus A330 crashed into the ocean May 31 with 228 people aboard after running into thunderstorms en route from Rio de Janeiro to Paris.
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