Aldama and Porter boost medal tally

Two athletes labelled "Plastic Brits" in some quarters for switching allegiance to run for Britain won medals at the World Indoor Championships in Istanbul.

Veteran Yamile Aldama, who previously competed for her native Cuba and Sudan, produced a brilliant jump of 14.82 metres to win gold in the triple jump.

And American-born Tiffany Porter, whose appointment as captain this week reignited the debate on the issue, claimed silver in the 60m hurdles behind Australia's Sally Pearson.

Aldama set a superb season's best in the second round, but then suffered a hamstring injury during her next attempt.

However, the 39-year-old did not need to jump again as none of her rivals were able to overhaul her. Olga Rypakova of Kazakhstan took the silver with 14.63m and Mabel Gay of Cuba claimed bronze with 14.29m.

In the hurdles, Pearson made the most of a stunning start to storm to victory in 7.73 seconds, with Porter just holding off Alina Talay of Belarus to claim the silver.

Dwain Chambers was unable to defend his 60m title but did claim bronze for Britain's third medal of the day and fourth overall.

American Justin Gatlin stormed to victory in 6.46s ahead of Jamaica's Nesta Carter, with Chambers taking third by the narrowest of margins ahead of American Trell Kimmons, with both athletes given a time of 6.60s.