she remembers hearing the familiar sounds of her irs colleague and friend, vernon hunter, walking intoming that morning. now, i didn't actually see vern. i just heard him come through. good morning, good morning. that's what he usually does. he was making his morning stroll. and then i finally get situated. and boom! >> a single-engine aircraft has crashed into a seven-story building. >> within seconds, i saw a big plume of black smoke. so i knew it had crashed. >> it was like a fireball. people let out a scream all around me. a few people were crying. >> some people were running. some people were peeling out of their cars and we could see smoke coming out of the back end of the building. >> the pilot apparently crashed into the building intentionally. >> stack slammed his plane between the first and second floors of this building. it exploded on impact. >> it's like the building kind of swayed. >> lisa alexander had no idea what had just happened. the impact was seismic. >> so it's like, i know we're not having an earthquake. then the explosion. it was like, oh, my god. and by that ti

she remembers hearing the familiar sounds of her irs colleague and friend vernon hunter walking into through humming that morning. i didn't actually see vernon, he was just going through, good morning, good morning, he was making his morning stroll. and then i finally get situated and, bomb. >> a single engine aircraft has crashed into a seven-story building. >> within seconds i saw a big plume of black smoke so i knew it had crashed. >> it was like a fireball, some people were crying. >> some people were running, some people were peeling out in their cars and we could see smoke pouring out of the building. >> a pilot crashed into the building intentionally. >> reporter: stack slammed his plane between the first and second floors of this building. it exploded on impact. >> it's like the building kind of swayed. >> reporter: lisa alexander had no idea what had just happened. the impact was seismic. >> it was like, i know we're not having an earthquake, and then the explosion, it's like oh, my god, and by that time the tiles start falling down and the ws start shattering and then it was