Drowning at Karioitahi Beach, southwest of Auckland

A person has drowned near Karioitahi Beach this morning. Photo / Google

A person has drowned at a beach southwest of Auckland.

Emergency services were called to Karioitahi Beach just before 11am.

"Police and emergency services are at a reported drowning," police said.

"Sadly, one person has died at the scene."

St John said they had treated a second person in a moderate condition.

The death will be referred to the Coroner.

Meanwhile, a search is underway for a missing person - believed to be a teen - who is missing at Lake Arapuni, in the Waikato.

A police spokeswoman said police received a report of a person missing in the water at the Jones River Landing area at Lake Arapuni about 8:25pm yesterday.

A search began last night and is continuing today, she said.

The Police National Dive Squad are expected to arrive later today from Wellington to help with the search.