OSHKOSH, Wis. (AP) -- Workers who witnessed a fatal construction accident on an Oshkosh bridge say a crane may have collapsed because a highway girder was being lowered too quickly or because the crane changed positions.

The witness accounts are contained in an accident report released by the Winnebago County Sheriff's Department. The crane collapse killed a 35-year-old construction worker from Green Bay and seriously injured another on the Butte des Morts bridge earlier this month.

A Spancrete employee told investigators he saw the 52-ton beam being dropped too quickly, saw the crane boom buckle and yelled at workers to run to safety. Another witness said the accident occurred when the crane, which was on a barge, had to be repositioned.

The Oshkosh Northwestern says the witness saw the crane move slightly, then tip forward.

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OSHKOSH, Wis. (AP) -- Safety investigators are allowing contractors to resume work on the Oshkosh bridge where a worker died in a crane collapse this week.

However, as a result of Thursday's accident, Lunda Construction is now under investigation for its second crane fatality this year.

A Lunda worker was operating a crane Thursday when a 52-ton girder collapsed and killed a 35-year-old Green Bay man. And in April, another Lunda employee was killed while unloading a crane in Brown County.

A U.S. Department of Labor spokeswoman says the company is now at risk of being placed in a severe-violator program, which mandates certain compliance inspections.

An Oshkosh Northwestern report says Lunda has received five safety violations since 2009.

A message left with the Black River Falls company Saturday wasn't immediately returned.

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OSHKOSH, Wis. (AP) -- One person is dead and another is seriously injured after a crane collapsed in Winnebago County.

County Coroner Barry Busby says the person died on the scene and the other person was taken to a hospital with serious injuries. He didn't want to release any information about the victims because their families hadn't been notified.

Department of Transportation spokesman Kris Schuller says a crane was trying to lift a beam on the Butte Des Morts bridge when it collapsed.

Authorities closed down the left lanes in each direction of Highway 41 for about 45 minutes starting at around 9 a.m. Thursday.