Four people were hospitalized and six others were injured after an early morning boating accident on Clear Lake. Authorities were called to the northern Iowa lake shortly after 2 a.m. on Sunday. The Iowa Department of Natural Resources says a 2000 Cobalt boat operated by 28-year-old Andrew Nicholas struck a public dock. Authorities say two 23-year-old victims, Nicholas and Taylor Olson, were taken by ambulance to a hospital for treatment. Two others, 22-year-old Erinn Heine and 23-year-old Michael Holmes, were driven to the hospital in private vehicles. Heine, Holmes and Taylor Olson were treated and released. Information about Nicholas Holmes wasn't available.