Was at my desk at Police HQ when we heard the first plane hit. Ran to the window and thought it was a bad car accident at the foot of the Brooklyn bridge at first, then we saw thousands of sheets of paper floating down from the sky and looked up to see what really happened. I watched 4 people jump when I decided I couldn't look anymore. As soon as I turned away the second plane hit and I knew my life as an NYPD officer would never be the same again.
They evacuated the building and were deciding what to do with us when the first tower came down. I looked up, thinking a third plane hit the Verizon building right above me. When I looked down I saw about 200 people running towards me trying to escape the dust cloud. I turned around and took off running. Got half way through Chinatown when I used a shop owners phone to call my wife (cell phones were useless). She explained to me that the first tower came down and the second came down while I was on the phone with her.
Not knowing what the hell to do and being scared sh*tless I made my way back towards the site. Someone had decided to start closing the area off so I linked up with the first Lieutenant I could find and just manned a check point to late that night.
Went to the site the next day. The surrounding area looked as if someone exploded a massive "blown insulation" bomb above the city. 4-6 inches of dust covered every square inch. The site itself was just a gigantic mound of twisted smoking steel that was beyond comprehension.
Over the next days, weeks, and months I worked site security. Never dug on the mound, just secured the perimiter. I will never forget that day (who could) and pray to God I make it through my remaining 9 years on the job so I can watch my kids go to college.