I was getting ready for work and watching the news. They were showing the first tower and mentioned the B25 that crashed into the Empire State building because they still thought it had been an accident. Then the camera suddenly shifted and there was the second plane crashing into the other tower.
I packed up my wind-up radio and headed to work. When I got there, I was told to be extra careful and report anyone who didn't seem to belong immediately. I set up the radio on one of the local all news stations in the conference room because the rest of the building was too well shielded to get a signal at my desk. Just after the 4'th plane hit the news, word got out about a possible stolen aircraft in the local area, so they decided to close down our building. We were told to stand by at home in case of emergency.
It was not easy to get home because the commuter trains were shut down untill they were able to check all the track and stations for hidden explosives. I ended up taking the subway (thank goodness thy felt that was secure enough to keep out terrorists with bombs) as far as possible and calling home for a ride. I spent the rest of the day remotely logged into the company network monitoring our remote dispatch systems.