SHANKSVILLE, Pa. -- With the anniversary of the Sept. 11 attacks less than two months away, Somerset County officials are planning a memorial service commemorating the crash of United Flight 93 in Shanksville.

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Family members of the victims who died aboard plane are expected to attend a memorial service at the crash site one year after the attacks.

Only about half the families have been to the site, most of them in the week following the attacks.

Susan Hankinson, the coordinator for the event, said the anniversary will be a solemn memorial to the sacrifices made by those who died that day.

A 2,000-pound bell will toll 40 times -- once every 10 seconds -- in memory of the passengers and crew who died on the plane.

Bells will also ring at the site of the World Trade Center and the Pentagon. The ceremony near Shanksville will include a performance by the Johnstown Symphony Orchestra and the 2nd Marine Corps Aircraft Wing Band and Honor Guard.

Organizers estimate from 25,000 to 30,000 could gather for the ceremony. About 5,000 people attended a memorial the night after the crash.

Investigators believe some of the passengers and crew who died fought with the four hijackers and caused the plane to crash into a field near Shanksville.

The area around the crash site will be secured three days before Sept. 11. Anyone wishing to attend the memorial will be bused in from parking lots outside the security cordon.

The site is now open to the public. Approximately 45 people arrived at the temporary memorial in the span of about 20 minutes Monday, not including 52 horsemen riding through the area to honor Sept. 11 victims.

WTAE reported last week that four members of the Oklahoma Western Heritage group are riding from Oklahoma City to New York as part of the "Ride 4 America."

Click here to review the Somerset crash site in pictures.

Previous Stories:

• July 10, 2002: House Bill Seeks Support For Flight 93 Memorial
• June 11, 2002: Flight 93 Widow Visits Sewickley School
• May 31, 2002: Giuliani Delivers Message Of Courage To Grads
• March 24, 2002: FBI: Flight 93 Relatives May Hear Tapes
• March 11, 2002: Shanksville Commemorates Crash Of Flight 93
• February 12, 2002: Buy Sept. 11 Bracelets
• December 6, 2001: Dispatcher Talks About Flight 93 Phone Call
• November 15, 2001: Flight 93 Hijacker's Voice Recordings Released
• October 11, 2001: Pilot Witnessed Flight 93's Final Moments
• September 12, 2001: Cities Knew Plane Was Coming, But Not Where