Race for 2020 Olympics: Istanbul, Tokyo and Madrid finish presentations; results to follow

All three cities bidding to host the 2020 Olympic Games moved to reassure members of the International Olympic Committee that their cities would host an excellent Olympics, amid threats of war, a nuclear fallout and a struggling economy.

At the posh Hilton hotel in Buenos Aires, Turkish Prime Minister Recep Tayyip Erdogan said on Saturday that awarding Istanbul the 2020 Games would send out a powerful message of peace to the Middle East region.

"We live at a time when our region and the world wish for peace and at this critical moment, we would like to send a strong message of peace to the world from Istanbul," said Mr Erdogan, who has been critical of neighbour Syria and has pushed for punishment over Syria's alleged use of chemical weapons on its people.

He added that that giving the Games "to a country where the population is predominantly Muslim would send out a powerful message".

Faced with a recent doping scandal, in which more than 30 athletes were banned, the bid team also reiterated Turkey's commitment to the fight against doping.

Likewise, Tokyo also moved quickly to distance itself from the Fukushima nuclear accident. Tokyo Electric Power Co., Fukushima's operator, had revealed that radioactive water continues to seep into the Pacific even though it has been more than two years after the 2011 meltdowns at three of its reactors.

"Some may have concerns about Fukushima," Japan Prime Minister Shinzo Abe said in his speech to IOC members. "Let me assure you the situation is under control. It has never done and will never do any damage to Tokyo."

Madrid rounded up the presentations with a slick presentation, reminding IOC members that it has been ready since 2005 when it made its first of three consecutive bids. And it is more than ready now, with almost 80 per cent of the infrastructure needed to host an Olympics up and running.

Addressing concerns about Spain's economy, Spain Prime Minister Mariano Rajoy said the the country is "on the road to recovery", with no inflation and growth already resuming after cutting public spending by more than any other leading economy. It is because of careful spending that Madrid 2020 has "perhaps the most reasonable and responsible financial foundation in recent Olympic history", added Mr Rajoy.

The announcement of the winning city is scheduled for 4am, Singapore time.