South African officials have stepped up their defense of Caster Semenya, warning of a ""third world war"" if the row over her sex stops her competing.

The 18-year-old 800m world champion has had medical tests following doubts about whether she is actually female.
South Africa's sports minister, the Reverend Makhenkesi Stofile, said: ""Caster is a woman, she remains our heroine. We must protect her.""
BBC Sport understands tests are likely to show Semenya has an intersex status.
That means that although she has been brought up as a girl and lives as a woman, she may prove to have both male and female sex characteristics.
Athletics world governing body the IAAF is still analyzing the results of Semenya's tests and wants to discuss them with the athlete.
It has indicated that she is unlikely to be asked to return the gold medal she won in Berlin, but questions remain over her future in women's sport.
Asked what would happen if she was barred from competition, Stofile said: ""I think it would be the third world war.
""We (would) go to the highest levels in contesting such a decision. I think it would be totally unfair and totally unjust.
""Neither Caster nor her family deserves this humiliation. None of them have done anything wrong. And we appeal that they be left alone.
""We have referred the matter to our lawyers to see how best her rights and interests can be protected.""
(Source: BBC)