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We have new details about the investigation into the san bernardino terror attack and what led fbi dive teams to that nearby lake where so far they havent found anything. cnn justice reporter evan perez is working the story for us. evan, i know youre getting new information. what are you learning? >> you know, brianna, one of the things that happens after terrorist attacks like this certainly people start asking what if. in this case what if the u.s. government, homeland security and state depar...