[UPDATE BELOW] A fire broke out on the 88th floor of 1 WTC this morning around 7:30 a.m. According to one witness, the area around the site is flooded with rescue vehicles and high-rise fire trucks. And an FDNY spokesman confirms that the fire was reported at 7:42 a.m., and 26 units (84 firefighters) are currently responding to the fire, which is not visible from the street.

No injuries have been reported at this time, and the degree of CIA involvement is still unclear. We'll update as more information becomes available. (On June 2nd there was a small fire on the 89th floor of the still-under-construction building.)

Update 8:41 a.m.: Port Authority spokesman Al Della Fave has not confirmed a fire at the building, and there are reports that it was a false alarm. The FDNY says the situation was resolved at 8:38 a.m., and that it may have been a "possible welding condition." (It may be that welding was mistaken for fire.) The FDNY spokesman could not confirm whether this was a false alarm.

Update 8:55 a.m.: CBS 2 is calling it a "smoke condition," possibly due to welding, but adds that no smoke was visible from the exterior of the building.