Companies Update Survivor Figures

Employees were evacuated from the American Express Tower and 7 World Trade Center in the wake of the attacks, but the company has no specific information as to whether all workers made it safely from the building, according to CBS.MarketWatch.com.

There is not word yet about the fate of a group of approximately 20 employees working in the now-collapsed 1 World Trade Center Tower, according to CBS.MarketWatch.com.

Aon Corp.

Occupying numerous floors of the South Tower, or 2 World Trade Center, Aon Corp., an insurance brokerage and consulting firm, had an estimated 1,100 employees working in the World Trade Center at the time of the attack. According to the company's most recent headcount, the "majority" of employees were accounted for by Wednesday afternoon.

Marsh USA

The insurance brokerage occupied floors 93 through 100 in the North Tower. Of the 1,700 employees reported to have been in the building at the time of the attacks, 1,000 have now been confirmed alive.

Thomson Financial

Thomson Financial had 2,000 employees in lower Manhattan and approximately 200 employees located in the World Trade Center.

"We have confirmed that almost all of our employees in lower Manhattan were in their respective buildings and able to exit the area quickly and safely," says CEO Pat Tierney.

Thomson Financial said Thursday that one employee appears to have been aboard one of the hijacked jets that crashed into 1 World Trade Center, and 10 were still missing.

Salomon Smith Barney

The company reported successfully evacuated all employees from 7 World Trade Center before the collapse. Salomon Smith Barney also said many branches are currently staffed.

Charles Schwab

All employees have been accounted for in the downtown Schwab offices but those branches remain closed, according to CBS.