At the time, I was Chief of the Technology Crime Crime Unit of the Nassau County District Attorneys Office, the county immediately to the east of New York City. The massive hole in the side of North Tower belied any possibility of this being a small plane. The size and position of the impact point led us all to begin wondering if this was an intentional act. The rest of the day was an unending series of phone calls, text messages and emails to determine what had happened, what was still coming our way.”]
Source: https://www.csoonline.com/article/3118410/memories-of-911-more-than-lost-buildings.html