A man has received critical head injuries after pointing a fake gun at people inside an Auckland home, police say.

The incident in Mt Albert Rd, Mt Roskill happened shortly before midday when a man is believed to have pointed the fake gun at a person living at the address.

The incident happened shortly before midday today.

Senior Sergeant Grant Miller said that the man was restrained by those at the address and appears to have received a serious head injury during this struggle.

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He has been taken to hospital in a critical condition.