Detectives believe a spate of car burglaries in the Penarth and Cardiff areas may be linked.
Detectives say homes in Cardiff Bay and Penarth are among those that have been targeted, along with other addresses in the Penlyan, Whitchurch, Rhiwbina and Llanedeyrn areas
The burglars are gaining quick entry through unlocked doors at night and making off with valuables, car keys and the vehicles themselves.
Among the makes of cars stolen are Mazda MX5, BMW, Mercedes, Audi, and Volkswagen.
South Wales Police believe the same individual or individuals are responsible.
Detective Inspector Phil Marchant said: "An investigation is ongoing to identify and locate those responsible for these recent burglaries, but in the meantime, I’d like to stress to residents just how important it is that their belongings, particularly car keys, are stored safely – even while in their own home."
The force is urging homeowners in the area to make sure their doors are locked and their car keys are kept hidden and out of sight.
Anyone with information about the burglaries should contact South Wales Police on 101 or use the live webchat. Alternatively, contact Crimestoppers anonymously on 0800 555 111.

Barry Rugby Football Club has lodged plans for extensions to its clubhouse and other works
Council Tax in the Vale set to increase by 6.5%
Plans scrapped for new boat depot on Cardiff Bay peninsula
Llantwit Major hosts week-long Peace Festival
Local residents in Cowbridge have banded together to buy a beloved piece of land
Welsh legend Max Boyce and record-breaking footballer Jess Fishlock honoured at St David Awards
New care home could be coming to Barry is council approves plans
50+ Forum Radio Show highlight by World Health Organisation as leading age-friendly initiative
“Long-established rural enterprise hub” has applied for retrospective use of a base to provide services to the “wider rural community”.
Vale Council named Employer of the year for Apprenticeships
Average Vale House Price rises to £300,000
Penarth Library shortlisted for Library of the Year Award
Keep Wales Tidy launch "Drive your litter home" campaign
Members return to the Senedd Siambr following redevelopment
Barry resident shares his story of Operation Pied Piper in new book
Council to engage with public over future of former Wilko Superstore in Barry