Radar detectors appear to be in hot demand with a number of Christchurch residents reporting brazen "smash and grabs".
A post on the Bishopdale Community Group on Facebook on Monday attracted more than 50 comments.
"Keep an eye out for this person and silver BMW. Scouted our small cul de sac in Nunweek Park at 4.57 last night and returned to smash our car window at 6pm to take a radar detector.
"The car was up our drive and it was completely brazen at this time of the day," the post said.