Cerys' parents, Terry and Julie Potter, were in court in Turkey today to hear a panel of judges hand down guilty verdicts to four men.
Her father told our reporter Kevin Ashford "We couldn't sit back and know that there were still children going on these death traps - and more children were going to get killed."
Two owners and two employees of Marmaris Rafting, the company which ran the excursion Cerys was on when the incident happened in 2010, were found guilty of reckless killing.
More top news
Videos taken by Aseel Muthana in the months before he left for Syria show he and Kristen Brekke pretending to be on jihad missions.
Decent spells of sunshine expected this afternoon and remaining largely dry. A cold evening with clear skies and showers in the west.
Plaid Cymru, Liberal Democrats and Greens hold informal talks about forming an Assembly election pact but no agreement is reached.