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WASHINGTON The Federal Aviation Administration does not know yet what caused battery problems on Boeing Co's 787 Dreamliner and cannot speculate when a comprehensive review of the plane will end, FAA Administrator Michael Huerta said on Wednesday.
The FAA and other regulators grounded the 787 last week after a series of incidents, including one battery-related event that required an emergency landing.
(Reporting By Jim Wolf; Editing by Gerald E. McCormick)