HAYSVILLE, Kansas (CNN) -- Agriculture Secretary Dan Glickman plans a weekend visit to the grain silos where an explosion Monday killed five men, and wants to know why grain-inspection reports were not passed on to a federal safety agency.

Meanwhile, crews worked feverishly to vacuum out grain piled inside a tunnel where the last of four men was believed to be trapped.

Officials from the Occupational Safety and Health Administration said they never received copies of two reports in the past 19 months that cited excessive grain dust at the DeBruce Grain elevator.

OSHA regulations prohibit more than one-eighth of an inch of grain dust in storage bins and on equipment, because the dust is highly explosive. Investigators believe a spark ignited the dust, starting a series of blasts.

Paul DeBruce, chief executive officer of DeBruce Grain, said the company, based in North Kansas City, Missouri, had responded to both reports by spending $100,000 to rebuild two dust collectors.

The company also was in the process of installing a dust- suppressor system that would apply mineral oil to the dust to reduce its flammability.

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