From the Battalion Chief Kenahan of the FDNY Safety Battalion debriefing of firefighter Banaciski:
“They told us to get out of there because they were worried about 7 World Trade Center, which is right behind it, coming down. We were up on the upper floors of the Verizon building looking at it. You could just see the whole bottom corner of the building was gone. We could look right out over to where the Trade Centers were because we were that high up. Looking over the smaller buildings.
“I just remember it was tremendous, tremendous fires going on. Finally they pulled us out. They said all right, get out of that building because that 7, they were really worried about. They pulled us out of there and then they regrouped everybody on Vesey Street, between the water and West Street. They put everybody back in there.
“Finally it did come down. From there – this is much later on in the day, because every day we were so worried about that building we didn’t really want to get people close. They were trying to limit the amount of people that were in there. Finally it did come down. That’s when they let the guys go in. I just remember we started searching around all the rigs.
“That was basically the rest of the day, the rest of the night. We were searching around rigs looking for men. That was it.”
I suppose they’re in on it too. There’s no other explanation!
Update: Many more firefighter quotes that put the lie to the bld.7 theories are below in the comments…