The PSNI has issued a warning after reports of youths throwing snowballs at vehicles.
Police say there have been reports in Derry, Strabane, Newtownstewart, Strathfoyle and Eglinton - with a car window smashed in one incident.
It comes as the winter weather is set to continue across NI. A new weather warning issued by the Met Office for snow and ice is now in place until midday on Thursday, January 19.
Read more: NI set to be hit with more snow and ice as new warning issued
Posting on Facebook, Police Derry City & Strabane said: "Over the past 24 hours we've had several reports from across the area of young people throwing snowballs at vehicles, including across the city, in Strabane, Newtownstewart, Strathfoyle and Eglinton. In one of these incidents, a car window was smashed and the driver and passenger left badly shaken. It's fortunate they weren't injured.
"Throwing snowballs at passing traffic is completely unacceptable, and during this spell of cold weather we're urging young people to stay away from this type of activity. While it is understandable young people want to enjoy the snow, throwing snowballs at passing cars is dangerous.
"The driver could lose control and end up colliding with another vehicle or a pedestrian. What might seem like a bit of fun can have really serious consequences.
"We'd urge young people to really think about the consequences of what they're doing and for their parents and guardians to have a conversation with them about why this type of activity is so dangerous."
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