This document provides a summary of events on September 11, 2001 through eyewitness accounts and news reports. It describes the experiences of Brian Clark, who was in the south tower of the World Trade Center during the attacks. It details his actions to evacuate others from the building and his escape. It also summarizes the timeline of events that day, including the crashes of four hijacked planes into the World Trade Center towers, the Pentagon, and a field in Pennsylvania. The summary describes the collapse of the towers and the immediate response by officials and the media.