Police are investigating after a man was critically injured in South Auckland late last night.

Inspector Kerry Watson, of Auckland, said the middle-aged man was taken by ambulance to Middlemore Hospital after emergency services were alerted to his plight just after 11.30pm.

A St John Ambulance spokeswoman said the man suffered critical injuries.

Police were making enquiries into how the man was hurt on Queen St, Otahuhu, Watson said.

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A scene guard would remain on site overnight, he said.