An investigation's underway after a dog attack injured three people in Christchurch's Bryndwr

One victim is in critical condition, following Saturday's incident.

Christchurch City Council says no previous complaints had been made about the two dogs involved in the attack - which have since been impounded.

The owner may voluntarily surrender the animals for euthanasia, though no decision has yet been made.

The attack comes just days after a fatal mauling of a 62-year-old woman in Northland.