However, it said that the 12 ships involved in Wednesday's search operation would continue with their planned activities.
According to the JACC, the Bluefin-21 autonomous underwater vehicle (AUV) has completed 80 percent of the planned underwater search for the missing jet's wreckage.
Malaysia Airlines flight MH370 vanished mysteriously about an hour after taking off for Beijing from Kuala Lumpur shortly after midnight March 8.
The Boeing 777-200ER was scheduled to land in Beijing the same morning. The 227 passengers on board included five Indians, 154 Chinese and 38 Malaysians.
In another development, Australian Prime Minister Tony Abbott said Wednesday that he has "no advice whatsoever to suggest that there is any truth at all" in a report by a Malaysian newspaper that the missing Malaysian aircraft has landed somewhere instead of having ended in the southern Indian Ocean.
"Our expert advice is that the aircraft went down somewhere in the Indian Ocean. We have identified a probable impact zone which is about 700 km long, about 80 km wide and based on the detections from what we still believe was the black box recorder," he said at a press conference in Canberra.
