Very very poor taste. I take it you were born after 2001 otherwise you wouldn't be asking such a question. People lived in fear about what or where it would happen next. I live on the other side of the world but I remember the day vividly as an 8 year old. I have visited the memorials in New York aswell. Think about how somebody would feel if their families members died on this day or still suffered the effects. I'm actually shocked you would even consider the twin towers as a form of advertising.
Low blow to use this imagery to advertise Very low.