(Bloomberg) -- The Malaysia Airlines flight that went missingone year ago Sunday had an underwater locator beacon whose batteryhad expired in December 2012, according to an interim report on theincident.

Flight 370 was also carrying 221 kilograms (487 pounds) oflithium-ion batteries that didn’t undergo the normal securityscreening, according to the report. The 584-page report by a teamwith representatives from China, Australia and other countries wasreleased by Malaysia, which led the investigation underInternational Civil Aviation Organization guidelines.

The compendium of flight details and data sheds little light onwhat might have caused MH370 to veer suddenly off its scheduledpath less than an hour into its flight to Beijing from KualaLumpur, losing contact with air-traffic controllers and radar. Thereport was released as relatives and friends of the 239 passengersand crew gathered in Malaysia and China to commemorate theevent.

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