Twenty years ago Dan Nicholls, a London based trader, printed out a page of Bloomberg News headlines.

He put it in his desk. It’s remained there ever since.

Faded and rumpled, it’s incredibly evocative.

Everyone who lived through 9/11 remembers where they were.

I was the New York Bureau Chief for Bloomberg News.

It was a Tuesday. The sky was blue. The air was crisp. I was at the office, which at the time was located at 499 Park Avenue.

The first plane hit the North Tower at 8:46 a.m.

We saw it on CNN. I stood behind stock market editor Phil Serafino as he sent headlines. Josh Hamilton filed the first article.

As that initial story shows, we had no idea what really happened.

When the second plane hit, we asked for volunteers to head downtown to report on the disaster. Tom Cahill raised his hand. Mike McKee was already downtown on his way to a conference for economists.

When the towers collapsed, everyone’s cell phone blacked out.

We couldn’t reach Mike or Tom. I was anxious.

The subways and buses stopped running. People fled the city and by the afternoon there were virtually no cars or taxis.

Everyone who worked downtown had to walk home.

Looking out the window onto Park Avenue you could see thousands of people streaming north. No one was talking.

Mike McKee walked back to the office. He was covered in dust, but otherwise unscathed. I was relieved when Tom Cahill showed up later.

Tragically, Bloomberg lost three employees who were working in the towers.

They are remembered on a Bloomberg page {OURS <GO>} and in a monument in the lobby.

It was a long time ago now.

But once a year it seems like yesterday.