Local official Dominique Sorain said that if no objects were found by next Monday "we will move to a phase of heightened surveillance".
"No object has been found in the sea that could belong to an airplane," Sorain told reporters Friday, adding however that "a certain amount of debris" had been found on land.
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The searches, which began last Friday, have covered nearly 10,000 square kilometres (almost 3,900 square miles) of ocean, Sorain said.
Police have spent 200 hours searching for debris, added Sorain, who gave no indication of the mission's cost.
The tiny Indian Ocean island of Reunion has been in the global media spotlight since the large wing part called a flaperon was discovered on its shores last month.
On August 5, Malaysia's prime minister said experts had "conclusively confirmed" that the debris came from the doomed flight, which disappeared mysteriously 17 months ago.
However, French investigators were more cautious, saying only there was a "very high probability" that the flaperon came from plane, sparking anger from relatives over the difference in language.
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