VERDEL, Neb. (AP) - An investigator with the Occupational Safety and Health Administatation is on the scene of a deadly trench collapse.

The Knox County Sheriff's office said the four men were working on the drainage trench Friday morning when a part of it collapsed. All four died.

The six-mile, $2.26 million project was scheduled to be completed in October.

The roadway has been damaged by flooding because of high Missouri River water levels. Flooding had saturated the roadway embankment, creating potential for erosion.

It hadn't rained in a few days in the area, but sheriff's officials said water appeared to be seeping into the trench at the site of the collapse.