Retired Australian Air Chief Marshall Angus Houston speaks to the media during a press conference about the ongoing search operations for the missing Malaysia Airlines Flight MH370 in Perth, Australia, Sunday, April 6, 2014. Houston, the head of the multinational search, confirmed that a Chinese ship had picked up electronic pulsing signals twice in a small patch of the search zone, once on Friday and again on Saturday, but he stressed the signals had not been verified as linked to the missing plane. (AP Photo/Rob Griffith)

Associated Press
Retired Australian Air Chief Marshall Angus Houston speaks to the media during a press conference about the ongoing search operations for the missing Malaysia Airlines Flight MH370 in Perth, Australia, Sunday, April 6, 2014. Houston, the head of the multinational search, confirmed that a Chinese ship had picked up electronic pulsing signals twice in a small patch of the search zone, once on Friday and again on Saturday, but he stressed the signals had not been verified as linked to the missing plane. (AP Photo/Rob Griffith)
Retired Australian Air Chief Marshall Angus Houston speaks to the media during a press conference about the ongoing search operations for the missing Malaysia Airlines Flight MH370 in Perth, Australia, Sunday, April 6, 2014. Houston, the head of the multinational search, confirmed that a Chinese ship had picked up electronic pulsing signals twice in a small patch of the search zone, once on Friday and again on Saturday, but he stressed the signals had not been verified as linked to the missing plane. (AP Photo/Rob Griffith)
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