Gunman kills three people at Iowa state park

Emergency personnel block an entrance to the Maquoketa Caves State Park (Nikos Frazier/Quad City Times via AP)

Three people were killed in a shooting at a state park in eastern Iowa on Friday morning and the suspected gunman is also dead, police said.

Officers responded to reports of the shooting at the the Maquoketa Caves State Park Campground before 6.30am, Mike Krapfl, special agent in charge of the Iowa Division of Criminal Investigation, said in a statement.