You can read the whole story here.  Long story short…Port Authority Police did not allow FDNY responders to enter the construction site when a worker fell two stories.   Although Squad 18 was eventually admitted to the site, other responders including the first arriving Engine 10, were kept out.

I’m not sure this was the result the Feds were looking for when they dumped millions of dollars into NIMS training, interoperability, and unified command.  If the response to the small stuff goes like this, what happens at the next major terrorist attack?