Police are investigating after a man was found critically hurt in an Auckland suburban town square.

St John sent an ambulance to the scene near Mangere town square at 3.40am this morning and transported him to Auckland City Hospital.

Detective Senior Sergeant Warrick Adkin confirmed police had started an investigation.

He said the man was being treated and a further update would be released when available.

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A witness says police have taped off a carpark behind Mangere Pharmacy, close to Mangere town square.

"Two police officers are in attendance, guarding the scene," he said.

"There is a blue tarpaulin covering evidence, with New Zealand Police tape tying it to nearby pallets."

"Alcohol bottles along with lots of rubbish could be seen across the carpark."