Tuesday August 15, 2000

Press Release

Metromedia Fiber Network Names Former Deputy Inspector General to Head Internet Security

Retired Brig. Gen. Daniel Doherty Named Chief Security Officer for Company

NEW YORK--(BUSINESS WIRE)--Aug. 15, 2000--Metromedia Fiber Network (NASDAQ:MFNX), the leader in deployment of optical Internet infrastructure within key metropolitan areas internationally, has appointed retired Brig. Gen Daniel Doherty Chief Security Officer for the company.

In this newly created position, Mr. Doherty will be responsible for the ongoing evaluation and management of security risks within the corporation; development, implementation and enforcement of global security policies, standards and procedures; and overall network security.

In this post, he will act as MFN's liaison to government agencies and the industry at-large to help develop preventive measures against cyber crimes and to establish industry security standards. He will also work with local and Federal law enforcement to pursue criminals who commit crimes against MFN to the fullest extent of the law. Integral to this effort, Mr. Doherty will build a cyber crime unit, which will further enhance MFN's Information Security Program.

Mr. Doherty brings nearly 30 years of experience in national and international law enforcement to his position. Previously, as Commanding General of the U.S. Army's Criminal Investigation Command, he led international law enforcement operations, including computer crime investigation and prosecution, spearheaded organizational and resource management initiatives, and trained international investigators. He has also testified before the House Services Committee on a variety of issues. With his unique background, Mr. Doherty has the experience and ability to evaluate the risks within the corporation and develop, implement and enforce an international security policy consistent with MFN's strategic plans.

``MFN is committed to ensuring that the Internet remains safe and our optical Internet infrastructure remains secure for our customers,'' said Nick Tanzi, president and chief operating officer of Metromedia Fiber Network. ``As our Chief Security Officer, Dan will help us to maintain the integrity of MFN's backbone and the Internet at large.''

Mr. Doherty received his commission from Officer Candidate School in 1968. He also earned a B.S. Degree in Business from Florida Southern College and an M.A. in Criminology from Sam Houston State University. He attended the Military Police Officer Basic and Advanced Courses, the Armed Forces Staff College and Senior Service College Fellowship (NATO Defense College in Rome).

About Metromedia Fiber Network

Metromedia Fiber Network, Inc., the leading provider of end-to-end optical network solutions, is revolutionizing the fiber optic industry. By offering virtually unlimited, unmetered bandwidth at a fixed cost, Metromedia Fiber Network is eliminating the bandwidth barrier and redefining the way broadband capacity is sold. Metromedia Fiber Network is extending metropolitan fiber optic infrastructure to the end user in strategic top-tier markets, enabling its customers to implement the latest data, video, Internet and multimedia applications. In addition to its current expansion in 51 cities in North America, Metromedia Fiber Network is establishing an international presence with planned fiber optic network builds in 16 cities throughout Europe.

Together with its subsidiaries, AboveNet Communications, Inc., a leading provider of co-location and Internet connectivity solutions, and Paix.net, Inc., the leading neutral Internet Exchange, Metromedia Fiber Network is unleashing the full potential of the Internet. The combined company facilitates the explosive growth of e-commerce and advanced Internet applications by delivering secure, reliable and scalable optical networks and IP services to Internet content and service providers, carriers and enterprise users worldwide. For more information about Metromedia Fiber Network, please visit the company's Web site at www.mmfn.com.

This news release contains forward-looking statements that involve risks and uncertainties. Factors that could cause or contribute to such risks and uncertainties include, but are not limited to, general economic and business conditions, competition, changes in technology and methods of marketing, and various other factors beyond the Company's control. This also includes such factors as are described from time to time in the SEC reports filed by Metromedia Fiber Network, including the most recently filed Form S-3 and Form 10-K, and its quarterly report on Form 10-Q for the quarter ended June 30, 2000.

     Gibbs & Soell, Inc.
     Gary J. Gatyas, Jr., 212/697-2600
     Metromedia Fiber Network
     Kara Carbone, 914/683-6386