Officials leak details of plots to bomb New York 's subway system , stock markets . Secret surveillance programs helped commit more than 50 terrorist acts , officials say . The police chief says intelligence leaks about the surveillance programs harmed security . NEW Headley later confessed to conducting surveillance and was convicted . : Official : ` ` If you 're looking for the needle in a thread , you have to have the haystack ''
Officials leak details of plots to bomb New York 's subway system , stock markets . Secret surveillance programs helped commit more than 50 terrorist acts , officials say . The police chief says intelligence leaks about the surveillance programs harmed security . NEW : Official : ` ` If you 're looking for the needle in a thread , you have to have the haystack ''