operations troops to go after every terrorist in the world. we can t conduct an bin laden style raid against every terrorist. reporter: senior administration officials say they had early indications winestein was dead back in february but only confirmed his death within the last several days. besides that internal review that s been ordered by the president, the cia s inspector general is aults expected to be on the case. the white house confirmed the families of these hostages will be compensated by the u.s. government. thanks. i want to turn to cnn chief national security correspondent jim sciutto. you re learning more about how officials were able to determine these hostages had indeed died in this attack. that s right. they didn t have a body dna evidence. it was a collection of evidence over time. as jim said there was a final crucial piece of evidence just this month which led them to the final conclusion that warren winestein and the italian had been killed.