CNN CNN Special Report April 7, 2014 05:52:00
Search for malaysia airlines flight 370. >> we have learned in the last couple of hours that a pinger locator has detected more audio signals from the southern indian ocean. pulses that are consistent with those emitted by aircraft flight recorders. >> now, these latest signals were picked up in the northern part of the search area by a u.s. pinger locator aboard the australian ship ocean shield. >> two distinct pinger returns were detected, which we're told could very possibly be from the missing airliner's two separate black boxes. but everyone is being very cautious at this point. >> includ...