At three o'clock in the afternoon the fire alarm sirens sounded and people left peacefully their workplaces, went down the stairs and gathered on the sidewalk in front of the entrance. We stood and chatted before, after twenty minutes, we returned to our respective rooms and placed us in front of the computer screens, many of us somewhat irritated at having been disturbed by the fire drill. Soon, however, my colleagues were running around in the corridors shouting that we all had to switch over our computers to the news channels and there I could see how an airliner crashed straight into one of the Twin Towers on Manhattan, shortly followed by another plane that flew into the second tower. Fierce fires developed and after almost an hour the South Tower collapsed in a dense cloud of dust, forty minutes later followed by the North Tower. We all stared spellbound at our computer screens and not much work was done during that afternoon.