NEW YORK, May 8 /PRNewswire-FirstCall/ -- ACM Municipal Securities Income Fund, Inc. ("ACM Municipal Securities"; NYSE: AMU), a closed-end management investment company, declared today, May 8, 2007, a possible final distribution payable to shareholders of record at the close of business on May 17, 2007. As of the close of business on May 18, 2007, the acquisition of the assets and the assumption of the liabilities of ACM Municipal Securities by Alliance National Municipal Income Fund, Inc. ("Alliance National Municipal"; NYSE: AFB) (the "Acquisition") will take place. The amount of the final distribution, if any, and payable date will not be determined until approximately the closing of the Acquisition. As previously announced, at a Special Meeting of Stockholders of ACM Municipal Securities held on April 13, 2007, the preferred stockholders of ACM Municipal Securities voting as a separate class approved the Acquisition. The Acquisition was previously approved by ACM Municipal Securities' preferred stockholders and common stockholders voting as a single class at a Special Meeting held on February 22, 2007. The Acquisition will occur as of the close of business on May 18, 2007. As a result of the Acquisition, stockholders of ACM Municipal Securities will receive shares of Alliance National Municipal equivalent in aggregate net asset value to the shares they held in ACM Municipal Securities. Stockholders participating in ACM Municipal Securities' dividend reinvestment plan will receive full and fractional Alliance National Municipal shares. Other stockholders will receive cash in lieu of fractional shares. ACM Municipal Securities is a diversified, closed-end U.S.-registered management investment company advised by AllianceBernstein L.P. As of May 4, 2007, the total net assets of ACM Municipal Securities were $215,347,213. DATASOURCE: ACM Municipal Securities Income Fund, Inc. CONTACT: Shareholder Contact: +1-800-221-5672 Web site: http://www.alliancebernstein.com/

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