The body of a teenage boy found in Sketty has now been formally identified as that of a 15-year-old boy from the Dunvant area of Swansea.
Police are investigating.
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More than 2,300 child sex offences were recorded by Welsh police forces last year - an average of more than six a day.
Rhondda MP Chris Bryant says security measures at the Palace of Westminster should be reviewed following yesterday's terror attack.
It comes after volunteer beach cleaners found balloon litter on beaches had increased by 53.5% between 2015 and 2016.