Montgomery County Emergency Management Director Brian Hamman reports this morning that the Midwest Regional Dive Team was enroute to the Lewis and Clark State Park in Monona County near Onawa, to assist authorities with a dive recovery effort at Blue Lake.

According to KETV in Omaha, a call for help came just after noon Wednesday. Officials said a man from Onawa was swimming with others when he went under water and never resurfaced. Search teams are also using cadaver dogs and a helicopter to assist in the search.