Working in London. It was just around lunchtime. One of the people in my team said a plane had hit the world trade centre. I thought he was joking until he showed me the single line on one of the news websites. All it said was a plane had hit one of the towers. We just thought it must have been a light plane, probably the pilot had a heart attack or something. Then all hell broke loose. I was working for an American company and we had a few Americans from New York working in senior management roles. We all went up to the large meeting room where we all watched things in real time on the tv. Our company was a subsidiary of another larger company that lost over 300 people.
They also evacuated the tower at canary wharf as it was thought that might be a target. It was a very surreal day.