Transcripts for CNN Wolf 20140407 17:00:00

i'm going to hand the baton over to my colleague wolf blitzer. his program starts right now. hello, i'm wolf blitzer reporting from washington. are those signals detected in the indian ocean from malaysian airlines flight 370? that's the question investigators are now scrambling to answer. they're following what's described as the most promising lead so far in the search for the missing plane. authorities say a u.s. pinger locator picked up signals consistent with those sent by a plane's black boxes. the australian ship is trailing the pinger locator through the latest area. about 375 miles northeast of pings detected by a chinese ship. teams are still investigating that development. new questions are emerging about the plane's route. a malaysian government source tell also cnn the aircraft