the u.s. embassy said, we are certain no that embassy employees or diplomats were involved in this incident on january 28th. however, a number of our u.s. embassy vehicles for stolen. we have heard reports of their use in violent and criminal acts. if true, we deplore these acts and the perpetrators. let's go to anderson cooper in cairo live tonight. what do you make of that? it seemed a strange day, a day that started promisingly, massive crowds in the square. gunfire and this appalling video. what's going on, do you think? >> well, first of all, that video is dated january 28 which was last friday. that was the day all hell broke loose in terms of violence. it was a difficult day. the u.s. embassy said a number of their vans were stolen. that's about all we know. it doesn't seem to make sense. the u.s. embassy was placed on