DETROIT, Aug. 16 /PRNewswire/ -- The Board of Directors of Comerica
Incorporated (NYSE: CMA) today authorized the Corporation to purchase up to 10
million shares, or 5.6 percent, of its outstanding common stock.

The shares will be purchased from time to time in the open market or
through negotiated transactions and used for general corporate purposes. This
action is in addition to an existing program with a remaining authorization to
purchase up to 42,000 shares.

Comerica Incorporated is a multi-state financial services provider
headquartered in Detroit, with bank subsidiaries in Michigan, California and
Texas, banking operations in Florida, and businesses in several other states.
Comerica has an investment services affiliate, Munder Capital Management, and
operates banking subsidiaries in Canada and Mexico. Comerica had 178 million
common shares outstanding and reported total assets of $49 billion at June 30,
2001.

SOURCE Comerica Incorporated

CONTACT: Media: Sharon R. McMurray, +1-313-222-4881, Wayne J. Mielke,
+1-313-222-4732, or Investor: Judith S. Love, +1-313-222-2840, or Judith M.
Chavis, +1-313-222-6317, all of Comerica Incorporated/