transmissions that they've been picking up are from flight mh-370's black box recorder, no one should underestimate the difficulties of the task still ahead of us. >> reporter: and he also warned the black boxes' transmissions were now failing because the batteries are running out. the australian authorities say they will continue to use the pinger locater to try to get a good fix until they are sure the batteries on the black boxes have run out, which is likely, of course, to be very soon. then they will send down a sub messable drone to search for wreckage on the sea floor. they're also warning, when they get down there, there is a lot of silt, so it could be a long process trying to find them. back to you, patty ann. >> david piper, live in bangkok, thailand, thank you. the search for clues into the deadly bus crash in northern california. federal investigators now at the scene. the latest on what they're focusing on. plus, president obama nominating his budget director to lead the