A graphic video's been posted on social media showing an elderly woman's skull being fractured.
Newry and Mourne PSNI did it to highlight the dangers of stoning passing vehicles.
They say it happens on a regular basis in Newry.
In the post, an officer wrote "It doesn't have to be a brick to cause serious damage or injury,
"A stone and the fact the vehicle is moving adds to the dangers."
‘Intensive work’ continuing to agree multi-year budget for Northern Ireland
By Jonathan McCambridge (Press Association)
Strength of evidence against man charged with murdering Lyra McKee questioned
By Rebecca Black (Press Association)
Teenage boy arrested over cyber attack on schools’ IT system
By Jonathan McCambridge (Press Association)
Ulster University to cut up to 450 jobs amid funding pressures
By Claudia Savage (Press Association)
Northern Ireland MPs call on Prime Minister to act amid fuel protests
By Abbie Llewelyn and George Thompson (Press Association)
Download the Q Radio app to keep listening, wherever you are! It's available on Apple and Android devices.
Download from the App Store Download from Google Play
