U.S. Thinks Underwater Banging Noises Might Have Been Vessels Searching for Missing Submersible 

U.S. officials suspect the banging noises rescuers heard during the search for a submersible on its way to the Titanic, which raised hopes of finding survivors, might have come from ships involved in the search, a U.S. official said Friday, as Canadian officials opened an investigation into the fatal voyage.