Holly Wells and Jessica Chapman were best friends.
They both lived in the village of Soham in Cambridgeshire, where they went to St Andrew's Primary School.
They went missing on Sunday 4 August 2002, when they were both 10 years old.
The girls were big David Beckham fans and were wearing matching red Manchester United tops with his name on when they disappeared. David Beckham even made a public appeal for the girls to come home.
Both the girls were friendly and popular, and Holly particularly loved music, and Jessica loved to swim.
There was a huge hunt for them all around Soham, led by the police and helped by hundreds of their friends and neighbours. Sadly, their bodies were found two weeks later on 17 August.