Olympics: Usain Bolt preparing for 200m race

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Usain Bolt is aiming for an unprecedented Olympic sprint double double when he runs in the 200m race.

The Jamaican won the 100m and 200m races at the Beijing Games and is aiming for a repeat at London 2012.

Elsewhere Team GB will aim to add to their haul of 22 golds, 13 silvers and 13 bronzes later.

And London Underground cleaners are launching a 48-hour strike and are picketing stations including Stratford after not getting an Olympics bonus.

Members of the Rail Maritime and Transport union employed by private contractors walked out at 05:30 BST.

General secretary Bob Crow said London transport cleaners were "on minimum pay rates doing some of the dirtiest jobs in often appalling conditions with no Olympics recognition and reward whatsoever".

But London Underground's Phil Hufton said the dispute was between private contractor Initial and its staff.

He said contingencies were in place and that London Underground anticipated "no impact" on services as a result of the strike.

Initial Facilities said it paid its employees the "London Living Wage" and that it was providing free Underground travel for staff during their shift throughout the Games period.

In other developments:

<ul> <li> The London Organising Committee of the Olympic and Paralympic Games (Locog) said the two millionth ticketed spectator passed through the Olympic Park since the beginning of the Games, with 6.9m spectators having seen Olympic sports overall</li> <li> The hospitality centre for African nations competing in the Olympics<a href="http://www.bbc.co.uk/news/uk-england-london-19190778" > has closed because of unpaid debts.</a> Africa Village, set up in Kensington Gardens, west London, owes suppliers hundreds of thousands of pounds, a spokesman said</li> <li> Britain's Rachel Cawthorn finished sixth in the kayak single 500m final</li> <li> Team GB's Jade Jones and Martin Stamper made it through to the taekwondo quarter-finals </li> <li> The men's 4x400m relay heat was won by Team GB's Nigel Levine, Conrad Williams, Jack Green and Martyn Rooney </li> <li> About 700 New Zealanders and their guests were evacuated from an Olympics party at Kiwi House, near King's Cross in central London, on Wednesday night <a href="http://www.bbc.co.uk/news/uk-19191284" >after a gas canister exploded</a></li> </ul>

Day 13 of the Games also sees the resumption of the battle at the top of the medals table between China and the US.

China is in the lead with 36 gold medals, and 77 overall, while the US is in second place with 34 golds and 81 medals overall.

Aside from Usain Bolt's attempt to make history when he runs in the 200m at 20:55 BST, Thursday's action also includes British open water swimmer Keri-Anne Payne's bid for gold in the women's 10km marathon, which is being held in the Serpentine lake in Hyde Park.

In the first ever Olympic women's boxing final, flyweight Nicola Adams takes on China's Ren Cancan after defeating India's five-time world champion Mary Kom on Wednesday.

Sailors Luke Patience and Stuart Bithell, meanwhile, are guaranteed at least silver in the 470 class medal race, although the start of that race has been delayed with no indication as yet when it might begin.

And in the individual dressage, Charlotte Dujardin is expected to be in the mix for a medal as she competes against her colleagues from Tuesday's gold-winning team performance, Laura Bechtolsheimer and Carl Hester.

Are you a London Underground cleaner? Are you striking today? What are your experiences of the London 2012 Games so far? Get in touch using the form below.

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