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　　The head of Russia's Anti-doping Laboratory GrigoryRodchenkov has resigned a day after a report bythe World Anti-doping Agency accused Russia ofwidespread cheating in athletics.Russia's SportsMinister said Mr. Rodchenkov was standing down totake all negativity away with him. Speaking to theBBC, the head of Russia's Athletics Federation Mihayev Gudolf acknowledged there was aproblem but it was what he called a mentality problem at coaching level. “We know our problem.We know our problem with doping. And of course we should change mentality of manycoaches,especially coaches in the regions. We started in April. We organized some educationalprograms. We met with a lot of coaches, with a lot of athletes.It's impossible to doimmediately, to change immediately. But we started to do it.”

　　The former head of World Athletics Lamine Diack who's been investigated in France overallegations of corruption and money laundering has been provisionally suspended by theinternational Olympics Committee. He was an honorary member.

　　Syrian government forces have ended a 2-year siege by Islamic State militants at the keymilitary airbase in the northern province of Aleppo. An army relief colonel pushed through ISlines and linked up with comrades who have been trapped in the Kuwairis base. State televisionhas shown jubilant soldiers pouring into the area. Analysts say the lifting of the siegeconstitutes a first significant victory of the government side since Russia stepped in andbegansupporting it with air power.

　　Prosecutors in the United States have charged two Israelis and one American with what's beendescribed as the largest cyber-attack on financial firms in US history. The men are accused ofmanipulating share prices, money-laundering and computer-hacking. James Cook reports.

　　“Prosecutors say Gery Shalon who's 31 years old founded and led a sprawling cyber-criminalenterprise with hundreds of employees in more than a dozen countries. His gang is accusedof stealing personal information from more than 100 million customers including 83 million ofthe banking giant JP Morgan Chase. They allegedly use the stolen emails,addresses andtelephone numbers to promote companies' stock they had bought cheaply driving up the pricebefore dumping it for vast profits.”

　　Eight US presidential hopefuls aiming to become the Republican Party's candidates next year arepreparing to do battle in Milwaukee shortly in the latest televised presidential debate. Two menfrom outside the political establishment businessman Donald Trump and retired neurosurgeonBen Carson are currently leading in the polls. This time the debate is chaired by Fox News. Ourcorrespondent Nick Bryant is in Milwaukee.

　　“This is Fox News's business channel. They're saying they wanna keep it on the economy.This's a pretty serious naughty question as Jerry Bader is there from the Wall Street Journalimpeccable journalist and pedigree kind of for the BBC initially. So we're expecting it a bitmore of serious-minded debate tonight.”

　　World news from the BBC.

　　The leader of Colombia's largest armed rebel group the FARC has said he had ordered theorganization to stop buying new guns and ammunition in September.Rodrigo LondonoEcheverri posted a message on Twitter saying the FARC wanted to show its commitment toscaling down the conflict with the Colombia army whichhas begun since the 1960s. The left-wing group and the Colombian governmenthave been engaged in peace talks for nearly threeyears.

　　The United Nations says Burundi's political violence is threatening to spiral into a large scaleethnic conflict, similar to that which occurred in neighboring Rwanda in 1994, prompting agenocide in which hundreds of thousands died. But a senior UN human rights official ScottCampbell warned that the UN is today in an even worse position to prevent slaughter. “Weactually had United Nations' peace-keeping operation on the ground mandated in Rwanda at thetimethe genocide took place. And in Burundi today, we have nothing at all in terms of a politicalpresence or peace-keeping presence.”

　　Portugal's minority center-right government has been toppled just two weeks after takingpower. A coalition of left wing parties voted down the administration's economic programpromoting its collapse. This could pave theway for a new anti-austerity government led by theSocialist Party which has promised to increase public spending. Portugal was one of thecountries hardest hit by the crisis in the Eurozone accepting an international bailout inexchange for sweeping cuts.

　　A popular tourist attraction in the United States made up of around a million pieces of bubblegum will soon be a thing of the past. Officials at Pike Place Market in the city of Seattle areblasting the city's famous gum wall with powerful steam cleaners getting rid of a 20 years worthof accumulated goo because they say it attracts rats. People first began sticking there come tothe wall while waiting for shows at a nearby theater. It's expected to take three days to cleanoff the estimated 1000 kilos of gum.