Australian authorities are trying to confirm a Chinese report of pulse signals that could be from the black box of the missing Malaysia Airlines plane.
The Australian defense minister warns there have been many false leads in the nearly month-old search for the jumbo jet.
Dozens of planes, ships and at least one nuclear submarine are scouring a section of the Indian Ocean in hopes of locating the Boeing 777 before the batteries powering the black box run down.
Meanwhile, Malaysia is appointing an independent investigation team.
The U.S., Australia, Great Britain, France and China have all agreed to send representatives. An independent team of investigators will launch a formal probe into the missing Malaysia Airlines plane.
The three parts of the investigation team are an airworthiness group, an operations group and a medical and human factors group.