In this image taken from video, a member of a Chinese search team uses an instrument to detect electronic pulses while searching for the missing Malaysia Airlines Flight 370, on board the patrol vessel Haixun 01, in the search area in the southern Indian Ocean, Saturday, April 5, 2014. China's official Xinhua News Agency reported late Saturday that the patrol vessel Haixun 01 had detected a "pulse signal" at 37.5 kilohertz (cycles per second) - the same frequency emitted by flight data recorders aboard the missing plane - in the search area in the southern Indian Ocean. But retired Australian Air Chief Marshall Angus Houston stressed the two electronic pulses that the Chinese ship reported detecting on Friday and Saturday had not been verified as connected to the missing jet. (AP Photo/CCTV via AP Video)

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