PERTH, Australia — Despite what Australia called an "intensifying search effort," an international hunt Sunday by aircraft and ships in the southern Indian Ocean found no debris linked to the Malaysian jet that vanished more than three weeks ago.
Several dozen angry Chinese relatives of Flight 370 passengers demanded "evidence, truth, dignity" from Malaysian authorities, expressing their frustrations at a hotel near Kuala Lumpur as the mystery drags on.
Nine aircraft and eight ships searching the waters off western Australia found only "fishing equipment and other flotsam" not connected to the Malaysia Airlines plane, the Australian Maritime Safety Authority said. The Boeing 777 disappeared March 8 while flying from Kuala Lumpur to Beijing with 239 people aboard.
But at least four orange objects that were more than 6 feet in size were seen by an Australian P3 Orion search plane crew, said the pilot, Flight Lt. Russell Adams, after returning to base. Adams said it was "the most visibility we had of any objects in the water and gave us the most promising leads."
The planes and ships are scouring a search zone that was redefined Friday based on satellite data from the Boeing 777, but they have found no debris associated with the flight, said Australian Navy Commodore Peter Leavy. The zone includes a shipping lane where trash is common.
Australian Prime Minister Tony Abbott insisted the "intensifying search effort" was positive because objects "have been recovered from the ocean" in the zone after a search in another area saw items from planes that ships never managed to find.
Ten planes and 10 ships will take part in today's search, the maritime agency said, with some parts of the zone expected to experience low clouds and rain — similar to Sunday's weather.