I was 2nd mate on a BP tanker at anchor off some port on the east coast of the US. Can't remember exactly which one now. Portland, Maine maybe.
Watched it on TV in the ships TV room, together with some others and the Chief Engineer. He had been hoping to get a chance to go ashore and meet up with his brother who lived in Boston. But then his brother had to go on a business trip somewhere.
We didn't find out until a few days later, but his brother was on the second plane that hit the twin towers.