Iowa state park shooting leaves 4 dead at Maquoketa Caves - Des Moines Register
- Iowa state park shooting leaves 4 dead at Maquoketa Caves Des Moines Register
- Police: 3 fatally shot at Iowa state park; gunman also dead The Associated Press
- Four Dead In Iowa Campground Shooting NBC News
- 4 Dead After Iowa State Park Shooting, Authorities Say The New York Times
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