"It's been very much narrowed down because we've now had a series of detections, some for quite a long period of time," Australian Prime Minister Tony Abbott said.
"Nevertheless, we're getting to the stage where the signal from what we are very confident is the black box is starting to fade. We are hoping to get as much information as we can before the signal finally expires," he told reporters in the east Chinese city of Shanghai.
"We are confident that we know the position of the black box flight recorder to within some kilometres. But confidence in the approximate position of the black box is not the same as recovering wreckage from almost 4.5 kilometres beneath the sea or finally determining all that happened on that flight," Abbott said.
The Prime Minister, however, said he would not go into further details until he had briefed Chinese President Xi Jinping personally.
"I grieve with all the bereaved, especially the family and friends of the 154 Chinese victims, and I offer them the assurance that Australia will not rest until we have done everything we can to provide comfort and closure," he said.
An Australian naval aircraft yesterday picked up an underwater signal in the same area where searchers in ships previously detected sounds consistent with a jet's black box.
However, the head of Joint Agency Coordination Centre (JACC) which is leading the search said today that the signal detected yesterday is "unlikely to be related to aircraft black boxes"
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