they agreed to. i don t anticipate at this stage that we re going to be making any sudden additional changes to the plan that we currently have. we will not give up on this mission because afghanistan must never again be a safe haven for al qaeda to launch attacks against us. now, that news conference comes amid tense moments today on the tarmac where defense secretary leon panetta made a surprise visit into afghanistan. a man driving a stolen pickup truck drove on to that runway as panetta s plane was touching down. joining us now from kabul, nbc s chief foreign correspondent richard engel. tell me more details what we know regarding this incident on the runway. reporter: we know that the defense secretary is safe. we ve been told that he was never actually in any physical danger. but it is a bizarre incident as it happened, we were told, the defense secretary was coming in to land on the runway. his plane had just apparently touched down on the runway when an afghan