Possible 5th underwater signal heard in jet search

PERTH, Australia (AP) - An Australian aircraft today detected what may be the fifth signal coming from a man-made device deep in the Indian Ocean, adding to hopes that searchers will soon pinpoint the object's location and send down a robotic vehicle to confirm if it is a black box from the missing Malaysian jet. The Australian air force P-3 Orion, which has been dropping sonar buoys into the water near where four earlier sounds were heard, picked up a "possible signal" that may be from a man-made source, said Angus Houston, who is coordinating the search off Australia's west coast.