A robber armed with a shotgun made off with cash from a Christchurch service station.

Police said a man entered the Mobil at the corner of Ferry Rd and Hargood St in Christchurch about 9pm yesterday.

He pulled a shotgun out of a black and white backpack and demanded money.

The man ran off with cash from two tills, heading north on Hargood St.

Police are appealing for information about this man after the armed robbery. Photo / NZ Police

The man was wearing a dark blue hoody, black track pants, and white sneakers. He was also wearing a blue and white bandanna, one black glove and one blue glove with an orange band around the wrist.

Police are appealing for witnesses to the robbery.

They are asked to call police on 03 363 7400 quoting file number 190515/4411, or anonymously call Crimestoppers on 0800 555 111 if they have any information.