Last updated at 06:18

Pictures: Day in pictures - 30 August

Photos of the day from 30 August 2013.
This man is trying to fight one of the huge wildfires in Santiago de Besteiros in Portugal using a bucket of water. The summer wildfires have hit forests and and large patches of countryside across the north of the country.
Man throwing bucket of water on a huge fire
Yes they are playing polo on elephants instead of horses! This is the annual King's Cup Elephant Polo Tournament in the resort town of Hua Hin, in Thailand. A total of 16 international teams and 51 Thai elephants take part in the tournament that runs from August 28 to September 1.
People playing polo on elephants
There's a new sporting star to keep an eye on as Britain's Dan Evans wiped out opponent Bernard Tomic in the second round of the US Open. Evans is the British number three but is ranked 179 internationally, while Australian Tomic is 52 in the world.
Dan Evans plays a backhand
Another day, another win for Usain Bolt as he powered to victory in the 100m in the Diamond League meeting in Zurich in Switzerland. The world and Olympic champion recovered from a slow start to clock 9.9 seconds to beat fellow Jamaican Nickel Ashmeade and American Justin Gatlin.
Usain Bolt
Thai customs officials show the media a haul of ivory they seized from a shipment from Angola via Thailand to Cambodia. It included 27 elephant tusks worth just under $500,000 (around £330,000) Two people have been arrested. Elephants and rhinos are endangered largely because of poachers killing them for their horns and tusks.
Customs officials hold tusks and show suitcases with ivory beads and more tusks inside.