Aon Corporation Provides Update On World Trade Center Tragedy.

Business Editors

CHICAGO--(BUSINESS WIRE)--Sept. 12, 2001

Aon Corporation (NYSE: AOC) said today that the vast majority of its approximately 1,100 World Trade Center employees have been reported safe as of this afternoon. Aon also said that it has contacted nearly all of its employees who were traveling to New York City from other offices. Aon employees at the command center in Glenview, Illinois continue to work around the clock to contact New York-based employees and their families, and further updates will be provided as information becomes available.

"We are still receiving initial telephone calls from employees in New York City who are letting us know they are safe," Aon Corporation Chairman and Chief Executive Officer Patrick G. Ryan said. "We urge employees and those with information about employees to contact our emergency hotline at 866.256.4154. Given the communication challenges in lower Manhattan and difficulties locating those who might have been injured or unable to return home, we are still working toward a full accounting of all of our employees' whereabouts." Ryan added, "We deeply appreciate the outpouring of assistance and concern being extended by other corporations."

Aon has numerous offices in the New York City area, and we are finalizing plans as to where our World Trade Center operations will relocate. We will provide this information to employees and clients as soon as it is available. New York City offices will continue to be closed until further notice. All other Aon offices will be open to assist clients and policyholders during this very difficult period. Employees again are asked to use their judgement as to when it is appropriate to return to their offices outside of New York City.

Crisis centers are in the process of being established to offer the following services. We will be providing exact location and contact information as soon as it is available:

-- Crisis counseling for employees and their family members

-- Human resource assistance for employees and their families including
worker's compensation assistance and other benefits

Information will be posted on Aon's website (www.aon.com) and provided through the hotline numbers listed below.

NEW YORK EMPLOYEES AND THEIR FAMILIES: New York office employees and their families, who have not yet contacted Aon, should call 866.256.4154 as soon as possible.

COUNSELING HOTLINE: A counseling hotline is available for Aon employees and their families who would like to talk to a professional counselor. That number is 888.437.3815.

NON-NEW YORK EMPLOYEES: Aon employees outside of New York should call 866.946.4357 for updates.

AON CLIENTS: Several numbers are available for Aon clients to call:

 Aon Risk Services:                   866.256.4157
                                      847.953.4071
 Aon Consulting:                      800.438.6487
 Aon Service Group:                   818.227.3420
 NY Private Risk Management:          866.225.5266
 (personal lines clients)
 Combined Life Ins. Co. of New York:  800.951.6206
 Combined Select Programs:            888.441.7936

Aon Corporation (www.aon.com) is a holding company that is comprised of a family of insurance brokerage, consulting and insurance underwriting subsidiaries. Aon's common stock is listed on the New York, Chicago, Frankfurt and London stock exchanges.

This press release may contain certain statements relating to future results, which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from historical results or those anticipated, depending on a variety of factors such as general economic conditions in different countries around the world, fluctuations in global equity and fixed income markets, changes in commercial property and casualty premium rates, the competitive environment, the actual cost of resolution of contingent liabilities, the final form of the business transformation plan, the ultimate cost and timing of the implementation thereof, the actual cost savings and other benefits resulting therefrom, whether the Company ultimately implements the proposed spin-off of its underwriting operations, and the timing and terms associated therewith. Further information concerning the Company and its business, including factors that potentially could materially affect the Company's financial results are contained in the Company's filings with the Securities and Exchange Commission.