If you have never watched this interview of three fire fighters on that morning of 9/11 take four minutes and watch this raw footage interview pay attention to the fire fighter who says about the second plane that hits the south tower being black in color, it was supposedly a United Airlines Plane, the only problem is United Airlines did not have black planes. Strange isn't it?
The fire fighters tell of three explosions on the ground floor level and the one firefighter was hit in the face from the explosion, it isn't a pretty sight but he was okay in the grand scheme of things.
This film though should make your "likely" be confirmed to there were bombs in the buildings.