HOUSTON – The first lawsuit already has been filed in a crane collapse that killed four and injured seven.

The lawsuit was filed on behalf of Grant Pasek, a worker injured after jumping from a raised bucket when he saw the 30-story-tall crane start to fall. It seeks a temporary restraining order to preserve the scene and evidence relating to the accident, attorney Jim S. Hart told the Houston Chronicle.

Two workers remained hospitalized and five others have been released.

The four men killed in the Friday afternoon accident were identified as Marion Hubert "Scooter" Odom III, 41, of Highlands; John D. Henry, 33, of Dayton; Daniel Lee "DJ" Johnson, 30, of Dayton; and Rocky Dale Strength, 30, of Santa Fe, Texas, according to Baton Rouge, La.-based Deep South Crane & Rigging.

Investigators with the Occupational Safety and Health Administration began their investigation Saturday morning, said David Roznowski, a spokesman for LyondellBasell refinery, where the accident occurred.

"It really is too early to say what happened," Mr. Roznowski said Saturday. "With the formal incident investigation, that's where we will start to get answers, but it's going to take time. We want to make sure no stone is left unturned and that this kind of thing doesn't happen again."

The massive 300-foot-tall crane, capable of lifting 1 million pounds, fell over at the southeast Houston refinery about 1:20 p.m. Friday, said Jim Roecker, the company's vice president for refining. The crane failed during maintenance, refinery officials said. It had not been scheduled to do any work until next week, but Mr. Roecker said its engine was idling after it hit the ground.

The Associated Press