The wife of a passenger aboard the missing Malaysia Airlines Flight MH370 prays during an event to mark one year anniversary of the plane disappearance. (AP Photo/Vincent Thian)

(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.

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