 That's CBS's Elaine Cobb reporting. Over in Australia, investigators are looking into a deadly bus crash that killed three people and left dozens injured. Reporter Scott Maiman. First responders were shocked by the devastation as they got to the crash scene. A crash of this nature involving this many people is a very significant and a very tragic incident. Superintendent Graham Payne, he says the extent of the crash is so big investigators can't even begin to work out what went wrong.