Officials with the Iowa Dept. of Natural Resources and Fremont County Sheriff’s Office said Sunday evening, a search was underway in the Missouri River near Hamburg for man who is missing after being swept under a barge Sunday afternoon.

The man, whose name is being withheld pending notification to family members, was a passenger in a boat that stalled shortly after launching from a Hamburg Mitchell boat ramp access landing, at approximately 2 p.m. The boat drifted a short distance downstream where it was swept under a barge that was moored to the bank. The missing man and boat had not been located by late Sunday afternoon.

The operator of the boat, 47-year old Johnnie Fields, of Shenandoah, was able to swim under the barge and was rescued downstream by people on shore. Neither of the men were wearing life jackets.

The incident remains under investigation by the Iowa Department of Natural Resources. The Southwest Iowa Dive Team was still on location Sunday evening. Hamburg Fire and Rescue, Riverton Fire and Rescue and LifeNet from Clarinda assisted the DNR at the scene.