alexis christopherrous has more on new threats facing the u.s >> reporter: law enforcement agencies acrosshe u.s. on alert for a.anniversary attack. marking one year this week that navy sales killed osama bin laden. >> we don't see any active plot underway. but we are maintaining our guard. >> u.s. officials say al-qaida does not have the capabilities they had on september 11th 2001. but they are concerned about affiliates in yes, ma'amen. >> they have demonstrated the ability to carry on an attack. >> >> reporter: the group was hype the failed under wear bomber in 2009 and cartridge bombs intercepted in u.s. cargo planes a year later the master builder of both devices recently resurfaced in yemen. >>> they are continuing to try to carry out an attack against u.s. persons. >> >> reporter: the u.s. said they are working with international partners to track down leads and won't rest until al-qaida is completely destroyed. alexis christopherous, "wjz," "eyewitness news." >>> us drone strikes in pakistan have eliminated many militant leaders overseas. >> >> back in the us an out-of- control va