Live - 2016 Olympics decision day

Four cities across four continents are waiting to hear if they have been chosen to host the 2016 Summer Olympics. Chicago, Madrid, Rio and Tokyo will discover their fate at 1800 BST on Friday, 2 October.

Chicago, the favourite, has had the backing of its former senator, US President Barack Obama. The Chicago bid cost £30.8m and promises five new permanent venues alongside four major stadiums already in place. Full bid guide

Madrid missed out with its bid to host the 2012 Olympics, but has spent £26.2m on a fresh bid to bring the Games to Spain four years later. Organisers say 85% of Madrid's prospective Olympic venues already exist. Full bid guide

Rio believes it has a strong claim to host the Olympics as they would be the first to be held in South America. The £26.3m bid divides the Brazilian city, which hosted the 2007 Pan American Games, into seven event areas. Full bid guide

Tokyo expects to build a new 100,000-seater stadium if it hosts the 2016 Olympics. The rest of the Japanese capital's £30m bid focuses on a compact, efficient Games, with 23 of the 34 venues ready to go. Full bid guide

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LIVE TEXT COMMENTARY (all times BST)

606: DEBATE Your thoughts on the action

To get involved text us on 81111 with OLYMPICS before your message. (Not all contributions can be used; UK mobiles only; network rates apply)

By Sam Lyon

Saltmartin on 606: "The emotional pull could be enough for Rio De Janerio and it would certainly be a spectacular venue for the games in a continent where it has never been. It all depends on their presentation though."

BBC sports news correspondent James Munro: "The Chicago bid really came alive when the Obamas came to the fore in their presentation - it is now a question of whether their impact is big enough to sway the IOC voters to their city."

BBC sports news correspondent James Pearce on Twitter: "Tokyo presenting at the moment. No way they can compete with the Obamas, even though they have Japanese Prime Minister here to argue their case."

0937: While Tokyo kick off their presentation then, a few Chicago bid facts for you. Their proposed budget is $4.8m, with $994m for construction and operation costs and a £2.5bn safety net in public and private funds. The Games will be based mainly around Lake Michigan in 31 venues, 15 of which already exist - most notably Soldier Field and the United Center. As an aside, Chicago residents buy 8m tickets to sporting events each year.

MarkE, Stevenage via text on 81111: "Just recalling how unbearable the tension was at decision time four years ago - only now do you begin to feel for the three losing bid cities. I'm hoping for a Madrid surprise victory, they had most votes at Round two of voting last time around but lost a lot of ground to us after New York went out."

Steveo77 on 606: "Chicago v Rio de Janeiro is the real contest with the Obama factor likely to swing it in favour of the Americans."

0926: Chicago entered today slight favourites to win the 2016 Games, lest we forget - although many will concede this year's race is just too close to call. As well as the Obamas' presence, the likes of basketball legend Michael Jordan, TV talk show host Proah Winfrey and secretary of state Hillary Clinton have all lent their support - and as shown by Tony Blair's influence in 2005 and Vladimir Putin's in 2007, personalities can be absolutely crucial to a bid team's success.

zorlack1966 on 606: "I'd like to see a Chicago win, the city has such a rich tapestry of sporting culture and history. Not to say the other cities don't, but I just feel there is something special about the windy city this year. Maybe it's because Barack Obama is from there - at the moment everything he touches seems to turn to gold."

BBC sports news correspondent James Pearce on Twitter: "My analysis of Chicago presentation: Michelle Obama absolutely fantastic - she spoke with real passion and in some ways upstaged her husband - and President Obama was very good. Rest average."

0915: So, the hard part for Chicago might just be done and dusted - and as expected the bid presentation was dominated by President Barack Obama and the first lady. Michelle opened up, referring to her father as her inspiration for bringing the Games to her hometown. "I am not just asking you to give us the Games as a Chicagoan or as an American, but also as a daughter. My father would have been so proud to see us here bidding for the Games," she said. President Obama followed with an empassioned plea to the IOC members to select Chicago as the host city, saying: "I was born in Hawaii and was taken to Indonesia so I never really had roots until I came to Chicago and discovered this most American of cities which nevertheless possesses 130 different ethnic groups. It is a rich tapestry of neighbourhoods. If you choose us we walk this path together."

BBC sports news correspondent James Pearce on Twitter: "Big day ahead in Copenhagen. So much at stake for the for the bids."

0907: A quick breakdown of today's timetable, then. Well, the Chicago bid team has already made their 45-minute presentation (followed by a 15-minute question-and-answer session) to the IOC members and are meeting the media as we speak - more on that in a bit - with Tokyo up at 0930, Rio de Janeiro at 1110 and Madrid last up at 1350. Following this there will be an IOC Evaluation Committee report, voting, and then the announcement ceremony from about 1730. We have reporters in Copenhagen and eyes and ears around all the teams and voters - what we don't have yet is you lot. I want you to get involved via text on 81111 or over on 606 and lend me your thoughts. Do it - and do it well - and I can make you web famous for 15 minutes. It's almost too much power for one man alone to hold some might say, but there you go.

0900: Four years and 86 days ago, Trafalgar Square played host to scenes of stunning celebration and a party to rival any thrown by Corey "Myspace" Delaney. It was July 2005 and London had been awarded the 2012 Olympic Games following a keenly fought contest against the likes of Paris and Madrid, and the start of a potentially legacy-building process began. Well today is the turn of either Chicago, Madrid, Rio de Janeiro or Tokyo. An International Olympic Committee ceremony in Copenhagen, due to conclude some time after 1730 BST, will select the hosts of the 2016 Olympic Games and it has come down to that quartet. Bed down now for a day of twists, turns, votes and vol-au-vents as I bring you all the gossip and news from Denmark, where experts have already been describing this as the closest bid process in history. It could be a bumpy ride.

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