thanks for watching. erin burnett "outfront" starts now. >>> "outfront" next the nsa says they've stopped dozens of terror attacks by snooping. they described a few of them in detail today. so here's the question. would americans have died if it were not for these secret snooping programs? >>> plus police say they have uncovered another instance of people being held captive for years in ohio, this time it was a mother and a daughter. and we're going to have the latest on that for you tonight. and then amanda knox, an italian court citing what might have happened the night her roommate was killed. a major development that could totally change knox's life. for a special report let's go "outfront." ♪ >>> good evening everyone i'm erin burnett. terror attacks foiled. today the head of the national security agency told congress the top secret surveillance programs, like the ones recently leaked by former nsa contractor