re-acquire the signals on two more occasions. late yesterday afternoon, and late last night perth time. the detection yesterday afternoon was held for approximately five minutes and 32 seconds. the detection late last night was held for approximately seven minutes. ocean shield has now detected four transmissions in the same broad area. wyy@ angus houston there. and also new analysis of the first two signals indicate they did come from an electronic device, and are consistent with the ping of a flight data recorder. the location of the pings has officials tightening the focus of the search under water and on the surface. >> but they're still throwing many assets at this today as we