The samples of Mosquera and Garcia Da Pena were tested at a World Anti-Doping Agency (Wada) accredited laboratory in Cologne.

BBC: La Vuelta runner-up Ezequiel Mosquera fails drugs test

The DA has been through numerous re-branding exercises since its origins in the anti-apartheid movement of the 1970s and 80s, but in the eyes of some people it remains a "white" party, led by a white woman, Helen Zille, and somehow out of touch with the core values of black South Africans.

BBC: Is the ANC losing its grip on South Africa?

Ms Zille, a white former anti-apartheid campaigner and one-time journalist, fought a jovial and energetic campaign, shining a light on the DA's efforts to bring better services to cities such as Cape Town.

ECONOMIST: South Africa's local elections