(CNN) -- The 850-square-kilometer swath of the Indian Ocean where officials have focused their hunt for missing Malaysia Airlines Flight 370 probably isn't the right place, the joint search agency said Thursday.
The area off the coast of western Australia is not the "final resting place of MH370," the Australia-based Joint Agency Coordination Centre said.
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Officials zeroed in on that zone after acoustic pings originally thought to be from the black boxes of the missing plane were detected in early April.
"The Australian Transport Safety Bureau (ATSB) has advised that the search in the vicinity of the acoustic detections can now be considered complete and in its professional judgment, the area can now be discounted as the final resting place of MH370," a statement from the JACC said.

Washington (CNN) -- The doubters have spoken.
A group of independent experts -- who prodded authorities to release satellite data on Malaysia Airlines Flight 370 -- says it thinks it knows the approximate location of the missing aircraft.
Five separate computer models all place the plane in a tight cluster of spots in the south Indian Ocean — hundreds of miles southwest of the previous search site.
"We recommend that the search for MH370 be focused in this area," the group said in a statement late Tuesday.
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"While there remain a number of uncertainties and some disagreements as to the interpretation of aspects of the data, our best estimates of a location of the aircraft (is) near 36.02 South 88.57 East," according to the statement, which was approved by 10 named experts.
The group opted to release its statement late Tuesday in advance of a BBC documentary on the missing plane, and ahead of the Australian government's announcement on the focus of the search, so that there would be no question about the independence of the group's findings, said one member of the group, American Mobile Satellite Corp. co-founder Mike Exner.
"We wanted to get our best estimate out," Exner said.
The group believes that after the Boeing 777 circumnavigated Indonesia, for reasons that are still unknown, the plane traveled south at an average speed of 470 knots, probably at a consistent altitude and constant heading, Exner said. All five computer models developed by the experts place the aircraft in a "pretty tight cluster...plus or minus 50 miles of each other," he said.