the president is going to do next. the president declared this an apparent terrorist act. he offered a prayer for the families, promised to hunt down in his words the people responsible for this. he will now travel back to washington and aides are telling us now that he will immediately convene a national security meeting to see what steps are taken next. >> david, i'm sorry to interrupt you but we're looking at live pictures of the pentagon where there is billowing smoke. jim miklaszewski just reported they heard an explosion. right now we're looking at an aerial view of the pentagon. mik, can you talk to us? >> officially nobody knows exactly what happened. i think the picture is pretty clear. according to one u.s. army officer who went running past me at a full trot, he said that it appears that a bomb was detonated at the heliport. the heliport is a helicopter landing area right next to the