Martha Fernback death: Friends pay tribute to drug death teenager
23 July 2013 Last updated at 09:15 BST
School friends have paid tribute to a 15-year-old girl who died after she took a drug she believed to be ecstasy.
Martha Fernback, a pupil at Cherwell School in Oxford, was at the city's Hinksey Park on Saturday when she collapsed.
Flowers and tributes have been laid at the scene, and her classmates and teachers have been offered support.