Officers in Cumbria are warning parents to be alert to signs of internet bullying over the summer holidays and to learn more about what their children are doing online.
Online threats are the biggest risk, but the police are also concerned about an increase in teenagers texting pornographic images.
The warning came as the Prime Minister said Britain had to do more to protect childhood innocence.
Dan Ashby reports:
More top news
The National Trust say they're "devastated" to have discovered wet rot in the beams of one of the Lake District's oldest buildings.
Performers gather for the free summer event takes place against beautiful backdrop of Dumfries and Galloway’s Morton Castle
Environment Agency and Annan District Salmon Fisheries Board crackdown on illegal fishing