Darren Chester, minister for infrastructure and transport, and Angus Houston, the former Australian defense chief who coordinated the early months of the search efforts, were among around 100 who attended the private ceremony at St. John's Anglican Cathedral in the east city of Brisbane to mark the third anniversary of the mysterious tragedy.
Several victims and relatives of the 239 passengers and crew aboard the Boeing 777 live in or near Brisbane.
"While to date we have been unsuccessful, we remain hopeful that at some stage in the future, there will be a breakthrough, the aircraft will be found, and we will be able to answer more of your questions," Chester said.
He told the gathering that included diplomats from Malaysia, China and New Zealand that a memorial to the lost passengers and crew would be erected in the west coast city of Perth which had been a base for Indian Ocean air and sea search crews.
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Australia, Malaysia and China in January suspended the sonar search for the airliner after a sweep of 120,000 square kilometers (46,000 square miles) of the Indian Ocean southwest of Australia failed to find any trace. The airliner for unknown reasons flew far off course during a flight from Kuala Lumpur, Malaysia, to Beijing on March 8, 2014.
Chester declined to comment on a suggestion by some relatives of raising funds to continue a private search of the ocean floor.
Australia's prime minister at the time of the tragedy, Tony Abbott, said in a newspaper interview last month that areas north and south of the searched zone should also be examined.
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