A Towed Pinger Locator sits on the wharf at naval base HMAS Stirling in Perth, Australia, ready to be fitted to the Australian warship Ocean Shield to aid in the search for missing Malaysia Airlines Flight MH370, 30 March 2014
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Underwater hunt for MH370 begins

4 April 2014 Last updated at 05:07 BST

Two ships equipped with electronic "pinger" search devices have started the underwater hunt for missing flight MH370's black box.

Angus Houston, head of the Joint Agencies Coordination Centre, told reporters that the vessels would "search a single 240km track converging on each other".

The wider search efforts are focusing on an area of about 217,000 sq km (84,000 sq miles), 1,700 km (1,000 miles) north-west of Perth.