Australian PM confident sounds are from Flight 370

PERTH, Australia (AP) - Authorities are confident that signals detected deep in the Indian Ocean are from the missing Malaysian jet's black boxes, Australia's prime minister said today, raising hopes they are close to solving one of aviation's most perplexing mysteries. Tony Abbott told reporters in Shanghai that crews hunting for Flight 370 have zeroed in on a more targeted area in their search for the source of the sounds, first heard on Saturday.