Fire was the primary cause of the collapse of World Trade Center Building 7 in New York City, according to a federal agency.

While the world ... Trade Center, Tower 1, to clean out his desk when 9/11 happened. Like many others trapped inside the Twin Towers, Gartenberg was able to contact his family. "Jill, there's a ...

for all of those who lost their lives," Brian Clark tells PEOPLE Stanley Praimnath was at his desk on the 81st floor of the World Trade Center’s South Tower on Sept. 11, 2001, when he saw an ...

Rare footage of the second plane striking the World Trade Center ... North Tower engulfed in smoke after being hit by Flight 11. Moments later, Flight 175 appears, hurtling toward the South ...

10:05 a.m.: The south tower of the World Trade Center ... 4:10 p.m.: Building 7 of the World Trade Center complex is reported on fire. 4:20 p.m.: U.S. Sen. Bob Graham, D-Florida, chairman of ...