An Australian navy ship, fitted with a sophisticated U.S. black box locator and an underwater drone, is set to join the search for the missing Malaysian passenger plane.
The Ocean Shield was to set out Monday to join the nine planes and eight ships already searching a large swath of the Indian Ocean west of Australia.
The search for the missing Boeing 777 jet is in its fourth week, but searchers have yet to identify any ocean-borne debris as connected to the aircraft.
It will take a few days for the Ocean Shield to arrive at the location where officials say Flight 370 may have gone down on March 8.
Meanwhile, dozens of angry Chinese relatives of missing passengers arrived in Kuala Lumpur Sunday, demanding more information about what happened to the aircraft, accusing Malaysian officials of withholding vital information. About two-thirds of the people on board the jet were Chinese.
The jet disappeared thousands of kilometers west of its intended flight path from Kuala Lumpur to Beijing.
Officials believe the aircraft crashed into the southern Indian Ocean far from land. They have not ruled out any cause, including terrorism or a hijacking.