I live not far from where their DC ground support team had been assembled. There were 75 taxicabs in that neighborhood. It was a real parking space concern ~ so we were all counting the cabs to see just how bad a problem we had.
On 9/11 that dropped to 15 taxicabs. 60 cabs, their drivers, their dependents, and others living with them in that townhouse development DISAPPEARED!
Since then we haven't had more than 18 cabs in the area ~ but we did have an AlQaida guy come back to the area to make contact. He was identified by Afghans and shot to death on a basketball court.
We lived with federal investigators staking out the area for several years.