concern. we make it clear again tonight that no matter how long it takes, no matter where you hide, if you are a threat to our people the united states will find you and take you out. a lot went into the drone strike and a lot may follow from it. we begin tonight with new details how it all came together and with chief national security correspondent jim sciutto. anderson, remarkable details coming out from a senior administration official tonight which speaks to a months long intelligence operation preceding this strike from a drone on saturday. we re told the president was first alerted to his presence in kabul in april, the start of april this year. but that had followed months where u.s. intelligence agencies had been tracking him, that he had moved to kabul ostensibly it seems to stay with family there, a downtown villa. in the course of those months cia and other intelligence agencies developed patterns of his and his family s behavior with intention of filing an
laden and they found a common cause. he talked about it a decade later. reporter: he was many places in the early 1990, even it s believed visiting california on a false passport. his group attacked egyptian embassies and tried to kill egyptian politicians. eventually he fold his group into al-qaeda. he pretty much led the group. he did the strategic policy of what al-qaeda s agenda was. he called the shots. reporter: he was at bin laden s side when he declared war on america in may 1998. weeks later they launched an attack on u.s. embassies in africa and then gloated after they escaped a u.s. cruise missile attack launched in
reporter: ail za war wi was many places in the 1990s, even explained visiting california on a false passport. his group attacked egyptian embassies and tried to kill egyptian politicians. eventually he folded his group into al qaeda. he s the number two guy. reporter: ail za war wi was at bin laden s side when he declared war on america in may 19988. a week later they launched attacks on the u.s. embassy and then later gloated after a missile attack. after the 9/11 attacks, ail za war wi began to become the voice of al qaeda taunting the u.s. translator: american people, you must ask yourself with why all this hate against america. reporter: after the invasion of afghanistan, bin laden and al zawahiri were on the run.