Nato summit: Obama to tackle Afghanistan's future - live coverage Anti-Nato protesters clash with protesters in Chicago. 10.21am: The Nato summit is expected to bring nearly 10,000 people to Chicago. This includes more than 7,000 delegates and staff, along with about 2,000 international journalists, according to summit officials. Mixed in with those folks will be protesters calling for an end to war in Afghanistan and for demilitarization in general, among other demands. And as everyone comes together this morning, we would like to propose a hug: 10.09am: Pakistan has announced that it has blocked Twitter because of a promotion on Twitter of a competition to draw the Prophet Mohammad. Mohammad Yaseen, chairman of the Pakistan Telecommunication's Authority, told the AP that the action was taken after Twitter did not comply with a takedown request. Facebook had cooperated with a similar request, Yaseen said. AP reports that Pakistanis are finding ways to use Twitter anyway: Many people based in Pakistan continued to use Twitter on Sunday despite the government's move to block the website by using programs that disguise the user's location. There was widespread criticism of the government's action by those on Twitter, who tend to be more liberal than average Pakistanis. "Another cheap moral stunt by Pakistan," tweeted liberal Pakistani columnist Nadeem Paracha. Some trivia: What do you think is the most famous tweet ever out of Pakistan? We'd go with this one from last May: 9.30am: Good morning and welcome to our live blog coverage of the Nato summit in Chicago. Tom McCarthy here in New York; in Chicago are my colleagues Adam Gabbatt and James Fassinger. Here's a summary of where things stand: Leaders of 62 countries plus the EU plus Nato are meeting in Chicago to discuss global security issues, foremost the war in Afghanistan. President Barack Obama will hold a side meeting with Afghan president Hamid Karzai. How long will coalition forces stay in Afghanistan; how long will it take to build up Afghan security forces; and who will pay for it? Those are the three big questions the summit will attempt to answer, not necessarily in order of importance. The United States already has pledged to cover half of the estimated $4bn annual cost of the war effort through 2014. Look for an agreement by the allies plus Gulf states to pay the rest. Obama will seek the cooperation of Pakistani president Asif Ali Zardari in allowing supplies for NATO forces to cross the Afghanistan-Pakistan border. Pakistan shut down the supply routes after a November Nato airstrike killed two dozen Pakistani soldiers. Nato said it was an accident. Prosecutors have brought terrorism charges against three men planning to protest against the Nato gathering who were arrested in a raid on a Chicago-area home Saturday. Police claim to have seized improvised explosive devices at the scene; a defense attorney says the cops took home brewing equipment and that the three men were entrapped. A judge set bail at $1.5m each. Protesters marched in Chicago and staged a peaceful sit-in on the street in front of Mayor Rahm Emanuel's house Saturday. Further major protest action is planned for today. Some of the world leaders convening in Chicago are fresh off a G8 summit at Camp David. In a statement released at the close of that summit, the G8 pledged to keep Greece in the eurozone and to promote growth. A reminder that when world leaders get together, no matter how grave the matters at hand, it's always entertaining. Look at Hollande: he isn't even pretending.