Police are concerned about a rise in reported door-stepping in Christchurch.

Since media attention earlier this month, they've had six additional calls from people reporting items missing from their homes in the suburbs of Hornby and Rolleston.

Senior Constable Bruce Ward says it's concerning that young people are going onto people's properties and remove items.

"The danger is these young people are 13 to 15, and there's an adult on that property, and there could be an altercation, and that's what police don't want."

Ward says the young people are looking for items to sell.

"I think thats money for drugs and cigarettes. Cigarettes are expensive, drugs are expensive, and their parents don't provide them with money so they go on to properties looking for items they can steal."

He says they are sending a message to young people that the police wont tolerate this behaviour.