eric lasser is digging deeper into those problems tonight, all new at 6:00. >>> one of the big stories across the country, the battle between the us us government and the massive company behind this, the iphone. several investigators are about the san bernardino terror attacks from one of the suspects phones. at first, that sounds like something apple would want to cooperate with tim cook is looking at a much bigger picture. he wrote an 1100 word letter to all apple customers, asking you if you own one of their phones, laptops, ipads or ipods, he explains that the us government has demanded apple taken unprecedented step which threatens the security of our customers. the opposed this order which has implications far beyond the legal case at hand. mark albers shows you why the suspects want to search through the phone and that could expose your information. >> investigator say the two carefully planned their bloody rampage which killed 14 people in san bernardino, but the couple's whereabouts leading up to the attacks and who they spoke to remain a mystery. >> we still have on one phone