An interim report into Malaysia Airlines flight MH370, published on the first anniversary of its disappearance, has given no new clues as to what happened to the plane.

An underwater locator beacon battery had expired a year before the plane disappeared, although it is unclear whether this impacted the search, the report reveals.

The report said that there was no evidence to suggest the battery was replaced and that while such a battery can operate past its expiry date, "it is not guaranteed that it will work or that it would meet the 30-day minimum requirement."

The battery on the plane's other so-called black box, the cockpit voice recorder, was replaced as scheduled and remained within its expiry date, the report said.

Investigators have found no indications of unusual behaviour among the pilots and cabin crew before the flight took off.

The airliner was flying from Kuala Lumpur to Beijing when it vanished.

Malaysia and Australia say they remain committed to finding the missing plane.

Read the report here