PITTSBURGH — The Families of Flight 93 have reached an agreement with a coal mining company to purchase about 1Z\x square miles of land needed for a planned national memorial, the organization said Tuesday.

The deal follows an agreement between PBS Coals Inc. and the state Department of Environmental Protection for the company to treat drainage from a former surface mine at the site about 65 miles southeast of Pittsburgh.

Flight 93 was en route from Newark, N.J., to San Francisco on Sept. 11, 2001, when it crashed as passengers apparently tried to rush the cockpit of the hijacked airliner.

All 33 passengers, seven crew members and the hijackers died.