Christchurch police are looking for a 59-year-old man, as they investigate the assault of an elderly couple.

A 72-year-old man and 80-year-old woman were attacked in their St Martins home on Friday.

They are in hospital recovering and are significantly traumatised.

Detectives have named the person they want to find as Douglas James Archer, who they think has vital information.

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He is believed to be travelling in a 1996 Honda Accord LXI sedan, registration number UJ7255.

Police warn he should not be approached.