Natural Resources Wales is investigating after almost 21 hours of storm overflow sewage was discharged over 48 hours during the Bank Holiday weekend at two North Wales beauty spots.

During the most recent Bank Holiday Llyn Padarn - a Site of Special Scientific Interest due to its marine life - was subject to 12 hours and 45 minutes of storm sewage discharge across Sunday and Monday, as hundreds of visitors were settling in for their half-term break.

Over the same period the River Ogwen saw eight hours of sewage discharge due to the heavy rain.