ARLINGTON – One worker injured at the Dallas Cowboys stadium construction site remained in critical condition Friday at Baylor University Medical Center with what his sister said was a serious blow to the head.

The two other injured workers have been released. One is expected to be back at work Monday, and the other could return to light duty soon, the stadium's general contractor said.

Hospital spokeswoman Susan Hall said the family of Wesley Harlow, the most seriously injured of the three, did not want to publicly comment about the accident.

But the sister of Mr. Harlow told WFAA-TV (Channel 8) that her brother had not regained consciousness.

Keith Cooper, vice president of Manhattan Construction, the project's general contractor, said he did not have details about the injuries.

"We just wish them the best and a speedy recovery," Mr. Cooper said.

Mr. Harlow's sister also said her brother, a 25-year-old Burleson resident, had been working construction since he was a teenager and had been with Derr Steel Erection Company of Euless for about eight or nine months. All three men work for that subcontractor.

The general contractor was not releasing the names of the workers.

Officials with Derr were at the construction site Friday investigating the accident and could not be reached for comment. The federal Occupational Safety and Health Administration also was investigating as work continued at the stadium, Mr. Cooper said.

He said the number of accidents at the stadium construction site has been slightly higher than the national average for commercial construction. But he said most sites don't have such a large number of employees. On an average day, he said, about 1,400 people work on the stadium.

There were 173 injuries reported at the stadium through June 12, according to a report by Manhattan. The largest number – nearly one-third – involved wrists, hands or fingers. About 7.5 percent involved the head or neck.

There were 20 injuries reported in May, the largest number for any month since construction started in 2006.

There have been two other high-profile accidents during construction of the $1.1 billion stadium. In August, a construction worker was injured when he was struck in the back with crane cables while on an upper deck of the new stadium. A worker fell 20 feet from scaffolding onto the field in January 2007.

There have been no fatalities.

The accident Thursday happened about 2 p.m. when a cable connector "failed" on a crane, allowing the cables and other parts to fall. The three workers jumped off the cab of another crane – which was being assembled – to avoid the falling debris.

Mr. Cooper said the injuries were apparently caused entirely by the 10- to 12-foot jump.

"No one saw anyone get hit by anything," he said.

Crane safety has been a national issue this year because of several high-profile fatalities, including incidents in New York City and Miami. In Dallas, a worker was killed Wednesday at a construction site when a cable snapped, causing a hook to fall and strike the employee.

The state of Texas and most cities do not regulate crane operations. That is usually done by OSHA.

Mr. Cooper said Manhattan requires all its subcontractors to inspect each crane every day.