our pentagon xpont barbara star has more on the air strike that killed al-awlaki. reporter: this is important. this man posed a direct threat to the united states had inspired him by all accounts ordered attacks against the u.s. now this apparently is the result of a two-year effort between the u.s. intelligence community and the people to go after him to find him, target him and take him out. very controversial as he is an american born citizen. killed for his activities in another country. by all accounts, it was a drone strike that killed al-awlaki. there were three other persons in that convoy with him. they are believed also to have been killed. this is something that the u.s. long wanted. this is a target that they were making a great effort to go after inside yemen even as that country remains in a good deal of political social and economic unrest. joe? barbara, if we know how much was yemen actually involved in this strike? and if we don t know that, typically wha