updated 1/23/2013 2:20:12 PM ET 2013-01-23T19:20:12

WASHINGTON (Reuters) - 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)

(c) Copyright Thomson Reuters 2013. Check for restrictions at: http://about.reuters.com/fulllegal.asp

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