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Yelena Isinbayeva, bronze medallist at London 2012 in the pole-vault, was among the 68 athletes to appeal the IAAF's ban.

Russian track and field athletes will remain banned from the Olympics following claims the country ran a state-sponsored doping programme.

The Russian Olympic Committee (ROC) and 68 Russian athletes attempted to overturn the suspension, implemented by the body that governs world athletics.

But the Court of Arbitration for Sport (Cas) has ruled it can stand.

A handful of Russian athletes could still compete as neutrals at the Rio Games, which start on 5 August.

"It's sad but rules are rules," said Olympic 100m and 200m champion Usain Bolt, who is targeting more gold medals in Rio.

He said it was important to send a strong message to the dopers.

"Doping violation in track and field is getting really bad," said the Jamaican, 29. "If you cheat or go or against the rules, this will scare a lot of people."

However, Russian pole vaulter Yelena Isinbayeva, 34 - one of the 68 to appeal to Cas - said the ruling was "a blatant political order", while the Russian Foreign Ministry called it a a "crime against sport".

Isinbayeva, who won Olympic gold in 2004 and 2008 and bronze in 2012, told the Tass news agency: "Thank you all for this funeral for athletics."

The International Association of Athletics Federations (IAAF) said it was "pleased Cas has supported its position", adding that the judgement had "created a level playing field for athletes".

IAAF president Lord Coe added: "This is not a day for triumphant statements. I didn't come into this sport to stop athletes from competing.

quote It would be naive to assume that what we're going to watch in Rio will be entirely clean, but today - at least - it got cleaner Mike Costello BBC athletics commentator

"Beyond Rio, the IAAF taskforce will continue to work with Russia to establish a clean safe environment for its athletes so that its federation and team can return to international recognition and competition."

Separately, the International Olympic Committee (IOC) is considering calls to ban all Russian competitors from the Rio Games following a second report into state-sponsored doping. It found evidence of Russian urine samples being "manipulated" across the "vast majority" of summer and winter Olympic sports from late 2011 to August 2015.

The World Anti-Doping Agency (Wada), which commissioned both independent reports into Russian doping, called on other sports to "consider their responsibilities".

Wada president Craig Reedie said the Cas verdict was about creating a "level playing field", not "punishing some athletes for the actions of others".

What now for Russia's athletes?

Some Russian athletes could compete in Rio as neutrals if they meet a number of criteria, including being repeatedly tested outside their homeland.

At least two - 800m runner and doping whistleblower Yuliya Stepanova and US-based long jumper Darya Klishina - have gone down that path.

Now the ruling by a three-person Cas panel has cleared the way for others.

Cas said the ROC could still nominate athletes to compete as neutrals. However, a Cas spokesman said the panel had expressed concerns that this left "no possibility" for athletes to comply with the criteria.

Who was on the Cas panel?

Three lawyers from Italy, Britain and the United States, widely regarded as amongst the most experienced judges on the court's list of around 400 approved arbitrators.

The chairman was Milan-based Luigi Fumagalli, who also sat on the panel which upheld Fifa's four-month ban on Uruguay's Luis Suarez for biting Italian defender Georgio Chiellini opponent at the 2014 World Cup.

Retired judge Robert Reid, from England, has chaired disciplinary committees for the Premier League and sat in judgment of Pakistan cricketer Salman Butt's failed appeal to Cas against a ban for fixing.

Finally, Jeffrey Benz from Los Angeles is a former legal adviser to the United States Olympic Committee.

Why were Russian athletes banned?

Russia was suspended from track and field events by the IAAF in November 2015 following the publication of an independent World Anti-Doping Agency (Wada) report that showed a culture of widespread, state-sponsored doping.

Sports minister Vitaly Mutko apologised for Russia's failure to catch the cheats but stopped short of admitting the scandal had been state-sponsored.

However, another Wada-commissioned report delivered earlier this week - the McLaren report - contained more damaging allegations and suggested senior figures in Russia's sports ministry were complicit in an organised cover-up.

The report implicated the majority of Olympic sports in the cover-up and claimed that Russian secret service agents were involved in swapping positive urine samples for clean ones.

Following Monday's publication of the McLaren report, the IOC faced calls to ban all Russian competitors from the 2016 Olympics and will hold an second emergency meeting on Sunday to decide its course of action.

How has Russia responded?

The Russian authorities have already suggested that they will look at ways to continue legal action.

Following the ruling, sports minister Mutko said Cas had set "a certain precedent" by punishing a collective group for doping offences by individuals.

Mutko, who was implicated in this week's McLaren report said he would not be resigning, and added: "I think there will be further defence of honour and dignity. Athletes may not have time to do this before the Olympic Games, but I think that it is probably time perhaps even to turn to civil courts. After all, these are rules that simply infringe human rights."

Kremlin spokesman Dmitry Peskov added: "The principle of collective responsibility cannot be acceptable. The news is not very good."

What about other reaction?

Sir Matthew Pinsent, Britain's four-time Olympic rowing champion:

"I hope the IOC will take courage from the fact there will not be a legal comeback to these decisions. Any other option will be a nonsense."

Louise Hazel, a former Olympic heptathlete from Britain:

"It's a sad business but it's also a step in the right direction. I commend everybody involved for taking a hard line. I'm really pleased to see they have taken a really strong stance and that the ban has been upheld."

Vera Rebrik, a javelin thrower from Ukraine who switched allegiance to Russia following the annexation of Crimea in 2014:

"I don't know whether to laugh or cry... I can't find the words."