Detectives in Christchurch are looking for a cyclist seen on security cameras in their investigation of a bank robbery.

Photo: NZ Police

The Kiwibank branch on Waimairi Road, Upper Riccarton, was robbed on Thursday around midday.

Staff were threatened with a firearm and cash was taken but no one was injured.

After reviewing the CCTV footage from around the time of the robbery, police released a photo of a man on a bicycle and appealed to the public for any information about him.

Police said the cyclist was last seen travelling on nearby Totara Street.