Police have lanuched a homicide investigation after a man died at a Whangarei motor camp.

Detective Inspector Dene Begbie said about 12:30am a man, who had sustained critical chest injuries as a result of what was believed to be a stabbing, arrived at the Otaika Motor Camp in Whangarei.

"Despite efforts to revive him, he died at the scene."

A post mortem will be conducted to confirm cause of death.

Police have launched a homicide investigation and are making inquiries as to how the man came to suffer his fatal injuries.

There is a forensic scene examination taking place at the motor camp today.