IDAHO FALLS, Idaho -- The director of the Idaho National Laboratory in eastern Idaho has halted all high-risk activities after a 3,000-pound piece of a metal shutter shield fell from a crane near an employee.

John Grossenbacher says the close call on Monday at the complex's Hot Fuels Examination Facility caused him to suspend work on Wednesday to make sure workers were paying attention to basic safety procedures.

He tells the Post Register that there were no injuries and no radioactive materials were exposed in the mishap.

Officials say the stand-down applies to all employees except those who handle activities needed for safety and compliance.

Grossenbacher says it could be several weeks or longer before high-risk work resumes.

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