Parents and six-year-old girl shot dead in tent at US park

Tyler Schmidt, left, and his wife Sarah pose with their son Arlo and daughter Lula, right, while hiking near Cedar Falls, Iowa (Schmidt and Morehead families)

A nine-year-old boy who was camping at an Iowa state park with his parents and six-year-old sister has survived a shooting that killed the rest of his family.

The Iowa Department of Public Safety identified the victims as Tyler Schmidt, 42, his 42-year-old wife Sarah Schmidt and their six-year-old daughter, Lula Schmidt, all of Cedar Falls, Iowa.