Olympic champion Caster Semenya files a new appeal to a Swiss court to challenge the decision regarding the restriction of testosterone levels in female runners.
Caster Semenya
Caster Semenya has won the Olympic 800m title twice and the world title three times

Olympic 800m champion Caster Semenya has filed an appeal to Switzerland's federal supreme court in response to losing her case against restricting testosterone levels in female runners.

The Court of Arbitration for Sport (Cas) had rejected the South African's challenge against the new rules imposed by athletics' governing body IAAF.

The 28-year-old said: "I am a woman and world-class athlete.