(Bloomberg) -- The Malaysia Airlines flight that went missing one year ago Sunday had an underwater locator beacon whose battery had expired in December 2012, according to an interim report on the incident.

Flight 370 was also carrying 221 kilograms (487 pounds) of lithium-ion batteries that didn’t undergo the normal security screening, according to the report. The 584-page report by a team with representatives from China, Australia and other countries was released by Malaysia, which led the investigation under International Civil Aviation Organization guidelines.

The compendium of flight details and data sheds little light on what might have caused MH370 to veer suddenly off its scheduled path less than an hour into its flight to Beijing from Kuala Lumpur, losing contact with air-traffic controllers and radar. The report was released as relatives and friends of the 239 passengers and crew gathered in Malaysia and China to commemorate the event.

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