PITTSBURGH -- A construction worker was killed and two others were injured Tuesday when part of the new David L. Lawrence Convention Center in downtown Pittsburgh collapsed.

Paul Corsi, 37, of Moon, was buried under steel beams and debris from the collapse of a steel support until about 5:45 p.m. He was a member of Iron Workers Union Local No. 3.

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David Lenigan, 41, of Pittsburgh, was treated for a minor leg injury at Allegheny General Hospital and released Tuesday night. Walter Pasewicz, 39, also of Pittsburgh, was also taken to AGH, and his injuries were not believed to be life-threatening.

A three-story steel frame collapsed at the section of the center which is being built opposite Penn Avenue, facing the Allegheny River. It fell just before 3 p.m., bringing down several beams. Officials were not sure of the reason for the collapse.

One injured worker hung from a beam as he awaited rescuers, and another worker rode the beams all the way to the ground, EMS Bureau Chief Robert Kennedy told WTAE's Sheldon Ingram.

It was the 13th of 15 supports running north to south which gave way. Steve Leeper, executive director of the city's Sports and Exhibition Authority, called it "a major support."

The first phase of construction is scheduled to be completed this month. Leeper said that work would likely remain on schedule, and it would be "the least of our concerns" if subsequent phases fell behind.

Leeper said he does not think workers in other areas of the center are at risk, but he said they could decide whether they wanted to work Wednesday.

Officials from the Occupational Safety and Health Administration were on the scene, as were Pittsburgh homicide detectives.

Part of the center's foundation shifted during construction in November, and 18 of 500 caissons along 10th Street were affected. The problem was reportedly fixed before Tuesday's collapse.

Leeper said the part of the building that will house the center's first show was not affected. The show, which will feature recreational vehicles, is set to begin Feb. 23.